What does F' stand for?

First Focal Distance [Symbol] [Optics] (ROG)

Second Focal Distance [Symbol] [Optics] (ROG)

Acceleration [Symbol] (DEN)

activity coefficient (SAUS)

Africa [MARC geographic area code] [Library of Congress] (LCCP)

Antiresonant Frequency (SAUS)

Atomic Orbital with Angular Momentum Quantum Number 3 [Symbol] (DAVI)

Breathing Frequency [Medicine] (DAVI)

Coefficient of Sliding Friction (SAUS)

distribution function (SAUS)

ellipsoid flattening (SAUS)

Face Value [Numismatics] (ODA)

faded (SAUS)

Fah [Intonic sol-fa] [Music] (ODA)

Farthing (ADWA)

Father (GEAB)

fathom (SAUS)

Feet [Industrial hygiene term] (OHS)

feet furlong (SAUS)

Female (DD)

Feminine (SHCU)

femininum (SAUS)

Femto [A prefix meaning divided by 10 to the 15th power] [SI symbol]

ferroconcrete (SAUS)

Fiant [Let Them be Made] [Pharmacology] (DAVI)

Fibers [Industrial hygiene term] (OHS)

Fiber Stress [Construction term] (MIST)

Figured Bass [Music]

filment (SAUS)

final values (SAUS)

finance charge (SAUS)

Fine (MIST)

Fission (SAUS)

Fixed Format (IAA)

Fluency (DIPS)

F-Number [Photography] (ODA)

Focal Distance (NTIO)

Focal Length [Photography] (WDMC)

focal length of image space (SAUS)

focal length of object space (SAUS)

focal ratio (SAUS)

focus of conic section (SAUS)

Foggy (SAUS)

Folio [On the Following Page] [Latin]

Following (WDMC)

following page (SAUS)

foot (SAUS)

fordable (SAUS)

Foreground [Computer science] (IAA)

Foreign (ODA)

Formulate (SAUS)

Formyl [As substituent on nucleoside] [Biochemistry]

Forte [Loud] [Music] (WA)

Fraction (IAA)

Fragment (BJA)

freezing (SAUS)

Frequency [Symbol] [IUPAC]

Frequently (DAVI)

friction coefficient (SAUS)

friction factor (SAUS)

frost (SAUS)

frost point (SAUS)

Fugacity [Thermodynamics]

full function (SAUS)

Fully [Expand] [Computer science] [Telecommunications]

fumble (SAUS)

Function (IDOE)

function of (SAUS)

Fundamental (SAUS)

Furanose [One-letter symbol] [Biochemistry]

fusion (SAUS)

fusion processes (SAUS)

Luminous Flux (DIPS)

Polar Flattening [Symbol] [Physics]

Respiratory Frequency [Breaths per unit of time] [Medicine] (DAVI)

Air Force Training Category [No inactive duty periods and 4 months minimum initial active duty training per year]

Atlanta [Branch in the Federal Reserve regional banking system] (BARN)

Bioavailability [Medicine] (EDAA)

Blue Second Hydrogen Line in the Solar Spectrum (BARN)

College of Future Education [British]

Consuetudines Feudorum [The Book of Feuds] [Latin] [A publication] (DLA)

Dealt in Flat [Investment term] (DFIT)

Degrees Fahrenheit (MCD)

Dominion Rubber Co. [Research code symbol] [Canada]

Eaton Laboratories, Inc. [Research code symbol]

energy fluence of particles (SAUS)

Fac [Let There Be Made] [Pharmacy]

Face

Facial Rash [Classification system used by doctors on Ellis Island to detain, re-examine, and possibly deny entry to certain immigrants]

Facial Surface [Dentistry]

Facies [Medicine]

Facing (WDAA)

Facsimile (SAUS)

Factor (DAVI)

Faculty of Advocates Collection of Decisions, Scotch Court of Sessions [A publication] (DLA)

Fahrenheit [German] (EG)

Fail (ADWA)

failed (SAUS)

Failure to Appear [Motor vehicle term used in state of Washington] (MVRD)

Fair

Fairchild (SAUS)

Fairing (SAUS)

Fair Skiing Conditions

Falck [When used in identifying W. F. Bach's compositions, refers to cataloging of his works by musicologist Falck]

Fall [Linguistics] (IEL)

Falls (ROG)

False

Family

Farad [Symbol] [Unit of electric capacitance] (GPO)

Faraday (SAUS)

Faraday Constant [Electrochemistry]

Farce (ROG)

Farenheit (SAUS)

Farrell Lines (SAUS)

Farthing [Monetary unit] [British]

Fascia (MELL)

Fast

Fasting [Test] [Medicine]

Fat

Father

Fatty Acid [Biochemistry] (HGAA)

Fawn (WGA)

Feast

February

Feces

Fecit [He, or She, Did It] [Latin]

Federal (AAGC)

Federal Design Council (EA)

Federal League [Major league in baseball, 1914-15]

Federal Reporter [A publication] (DLA)

Federation (ODA)

Federation of International Country Air Personalities (EA)

Feedback

Feed Rate (SAUS)

Feet [or Foot]

Feldspar Subgroup [Orthoclase, albite, anorthite] [CIPW classification] [Geology]

Feliciter [Happily]

Fell [Horse racing]

Fellow

Fellow of (SAUO)

Felon

Female

Feminine

Femmes [or Feminin] [Initial used as title of a publication]

Femur (MELL)

Fen [Monetary unit] [China]

Fendi [Italian couturier]

Fenoterol [Pharmacology]

Fermentation [Biology]

Fermi [Later, Femtometer] [Unit of length] [Nuclear physics]

Ferrosan [Sweden] [Research code symbol]

Ferrule Contact [Lamp base type] (NTCM)

Fertile [Medicine]

Fertility (SAUS)

Fertility Factor [Genetics]

Fertilized

Fetal [Medicine]

Fetch [Computer science]

Fever (MELL)

Fiat [Let It Be Made] [Pharmacy]

Fibre [Classification key in textile printing]

Fibroblast (MELL)

Fibrous

Fibula (MELL)

Fiction

Field

Field of Vision [Medicine]

Fighter [Designation for all US military aircraft]

Fiji (BARN)

Filament (AAG)

Filaria [Microbiology] (MAE)

File [Computer science]

Filial Generation [Biology]

Filius [Son] [Latin]

Fill (MIST)

Filly [Thoroughbred racing]

Filter

Final [Telecommunications] (TEL)

Final Target

Finance [or Financial]

Fine [End] [Music]

Fine [Designation on brandy labels]

Fine [Condition] [Antiquarian book trade, numismatics, etc.]

Finger

Finish

fiord (SAUS)

Fir and Hemlock Door Association (EA)

Fire

Fireman [Navy rating]

Firm

First (SAUS)

First Class [Airline fare code]

Fischer [Rat strain]

fishing mortality rate (SAUS)

fission rate (SAUS)

Fitted as Flagship [Suffix to plane designation]

Fitter [Navy rating] [British]

Fitzherbert's Abridgment [1516] [A publication] (DSA)

Fixed [JETDS nomenclature]

fixed broadcast (SAUS)

fixed broadcasting (SAUS)

Fixed Head (NITA)

Fixed Length (SAUS)

Fixed Light [Navigation signal]

Fixer [Photography] (DGA)

Fixing (SAUS)

Flag [Computer science]

Flagship (SAUS)

flair (SAUS)

Flame (SAUS)

Flanged Joint (DNAB)

Flap (SAUS)

Flash [Precedence] [Telecommunications] (TEL)

Flashless (SAUS)

Flat

Flat Band Metallic Armor (AAG)

Flat-Tainers [British] (DCTA)

Fleet

Fletcher Challenge Investments, Inc. [Toronto Stock Exchange symbol] [Vancouver Stock Exchange symbol]

Flexion (MELL)

Flied Out [Baseball]

Flight (SAUS)

Flint (AAG)

Floaters (MELL)

Florida State Library, Tallahassee, FL [Library symbol] [Library of Congress] (LCLS)

Florin [Monetary unit] [Netherlands]

Floryn [Florin] [Monetary unit] [Afrikaans]

Flow [of blood] [Medicine]

Flower

Fluency [A factor ability] [Psychology]

Flugzeug [Airplane] [German military]

Fluid

Fluid Ounce

Flunk (CDAI)

Fluorescence (SAUS)

Fluoride

Fluorine [Chemical element]

Fluorochrome (SAUS)

Fluorouracil [Also, FU] [Antineoplastic drug]

Flush (SAUS)

Flutter Wave (MEDA)

Flux (SAUS)

Fly [Baseball term] (NDBD)

Flying [Officer qualified as both pilot and observer] [British]

Flyout [Baseball term] (NDBD)

Focal (SAUS)

Focal Length [Photography]

Focus [Medicine] (EDAA)

Foetal (SAUS)

Fog [Meteorology]

Foil [Dentistry]

Fokker [Aircraft] (ODA)

Folacin (MELL)

Foley [Medicine] (BCRP)

Folge [Series] [Publishing] [German]

Folio [Book 30 centimeters and over in height]

Following [Pages] [Also, FF] (MUGU)

Follow-Up

Font

Fontanel (MELL)

Foolscap (ODA)

Foord's Cape Of Good Hope Reports [South Africa] [A publication] (DLA)

Foord's Supreme Court Reports [Cape Colony, South Africa] [A publication] (DLA)

Foot [Medicine] (EDAA)

Footwear Council (EA)

For

forad (SAUS)

Foraging [Ornithology]

Foramen [Anatomy] (MAE)

Force [Symbol] [IUPAC]

Ford Motor [NYSE symbol]

Ford Motor Co. [Wall Street slang names: "Tin Lizzy" or "Flivver"] [NYSE symbol] (SPSG)

Forecastle

Forest [Soil biology] [Vegetation] (QSUL)

Forint [Monetary unit] [Hungary]

Form [of]

Form [Letter] [Computer science] [Telecommunications]

Form [Rorschach] [Psychology]

Forma [Form] [Latin]

Formaldehyde Task Force Fund (EA)

Formality

Formant [Linguistics] (IEL)

Formed

Form Response [Used in Rorschach test scoring] (DIPS)

Formula

Formulary [Medicine] (EDAA)

Fornix [Neuroanatomy]

Fort (ROG)

Fortasse [Perhaps] [Latin]

Forte [Loud] [Music]

[The] Forum (AAGC)

Forward

Forward America (EA)

Forward Compartment

Forward Journey [Indian Railway] (TIR)

Fossa (MELL)

Foul

Foul Fly [Baseball term] (NDBD)

Founded (EY)

Fox [Phonetic alphabet] [World War II] (DSUE)

Foxtrot [Phonetic alphabet] [International] (DSUE)

Fraction [Medicine] (EDAA)

Fractional (MAE)

Fractional Concentration [in dry gas phase] (AAMN)

Fracture

Fragile

Fragmentation

Fragment of an Antibody (DAVI)

Frame (SAUS)

Frame Construction

Franc [Monetary unit] [France]

Francais [French]

France [IYRU nationality code]

Frankfurt am Main [German license plate city code]

Fraser [James E.] [Designer's mark, when appearing on US coins]

Fraser, Inc. [Toronto Stock Exchange symbol]

Fraser's Scotch Court of Sessions Cases, Fifth Series [A publication] (DLA)

Frater [Brother] [Latin]

F ratio (DIPS)

Freddy [Phonetic alphabet] [Royal Navy] [World War I] (DSUE)

Free [Rate] [Value of the English pound]

Freeboard (SAUS)

freedom (SAUS)

freedom, degree of (SAUS)

Free Energy [Physics] (BARN)

Freehold [Legal term] (ROG)

Freeway (ADA)

Freight Forwarders Institute (EA)

Freight Forwarders Tariff Bureau (EA)

Fremskridtspartiet [Progress Party] [Denmark] [Political party] (PPE)

French [Catheter size] [Medicine] (DAVI)

frequence (SAUS)

Frequency

Frequency of Fading [Broadcasting]

Frequent [In mention of occurrence of species]

Freshwater [Load line mark]

Friable (SAUS)

Friar

Friction

Friday

Frogerius [Rogerius Beneventanus] [Flourished, 12th century] [Authority cited in pre-1607 legal work] (DSA)

From

Front (KSC)

Frontal [Medicine] (DAVI)

Frontal Sinus [Otorhinolaryngology] (DAVI)

Froude Number [IUPAC]

Fstic [A fanzine]

Fuchsia [Genotype of Phlox paniculata]

Fuel

Fueler [Aircraft designation]

Full

Full Load [Displacement]

Fullword (SAUS)

Function

Fundus (MELL)

Furlong [Unit of distance]

Furlough [Military] (ADA)

Furness (SAUS)

Furness Lines (SAUS)

Furstenau [Medicine] (EDAA)

Fusarium Wilt [Plant pathology]

Fuse (DEN)

fusibility (SAUS)

Fusiformis [Microbiology] (MAE)

Fusobacterium [Microbiology] (MAE)

Fuss [Feet of organ stops]

Fuze (SAUS)

Gilbert [Unit of magnetomotive force] (DAVI)

Goals For [Hockey]

Helmholtz Function [Symbol] (DEN)

Inbreeding Coefficient [Genetics] (DAVI)

Individual [Missile launch environment symbol]

Intelligence for which the Source Reliability Cannot be Judged

Interceptor [Aircraft]

Lab. Funai [Japan] [Research code symbol]

Libri Feudorum [A publication] (DSA)

Luminous Flux [Physics]

Mutuel Field [Horse racing]

Of The [Telegraphy] (PCTE)

Phenylalanine [One-letter symbol] [Also, Phe]

Photoreconnaissance [Aircraft designation]

rate of aqueous formation (SAUS)

Requires Food and Water [Search and rescue symbol that can be stamped in sand or snow]

Society of Friends (SAUO)

Upper Ionized Layer of the Ionosphere (BARN)

Variance Ratio (DIPS)

Vendredi [French] (ASC)