What does dud stand for?

dependably undependable (SAUS)

Dudley (SAUS)

Dudley's Georgia Reports - A publication (DLA)

Design under Design

Duchenne Muscular Dystrophy - Medicine (DB)

Dunedin - New Zealand - Airport symbol (OAG)

Duodenal Ulcer Diet - Medicine (MELL)

duodenal ulcer disease (SAUS)

Hun-Saare - Language code (ETLW)