IU means Insulated Underwear in Veterinary
Similar to IU
ABM - Assured British MeatABO - Air-Breathing Organ
ABPI - Association of the British Pharmaceutical Industry
ABRAVAS - Associato Brasileira de Veterinarios de Animais Selvagens Brazilian Small Animal Veterinary Association
ABRS - Association of British Riding Schools
ABS - American Breeder Service
ABS - Animal Behavior Society USA
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