What does Hx stand for?

Hemopexin - Medicine (EDAA)

Hexode (DEN)

Hexyl - Biochemistry

History - Medicine

Hospitalization (DAVI)

Hypophysectomized - Medicine

Hypoxanthine - Also, Hyp, HYPX - Biochemistry

History - Medicine (BCRP)

Half Duplex (IAA)

Halifax Corp. - AMEX symbol (SPSG)

Halifax Engineering, Inc. - AMEX symbol (COMM)

Hamburg Airlines - ICAO designator (AD)

Have Cancelled - Travel industry (TRID)

Headroom Extension (SAUS)

Heat Exchange (SAUS)

Heat Exchanger (MCD)

Hereodox - Commercial firm - British

Hexagonal - Technical drawings

High Expansion Foam (WDAA)

High Index (SAUS)

Histiocytosis X - or Histocytosis X - Hematology

Hoexter - German license plate city code

Hydrogen Exchange (PDAA)

Hyphen - Telegraphy (PCTE)

No Specific Working Hours - ICAO (FAAC)

Operating hours on request (SAUO)

South Pacific Island Airways, Inc. (SAUO)