- agar emulsion
- agar_agar
- audubon's caracara
- acarus
- atrial venous pulse
- albuquerque
- aegospotamos
- aegyptopithecus
- actiontheraphy
- acanthia lectularis
- artaxerxes
- artaxerxes i
- apudoma
- apyretic tetanus
- allantoid
- a game played with oblong dice (3 in number) or with kauṛi:s (on a cloth or board having two transverse bars in the form of a cross)
- a mediator
- a cow_dung cake
- at a discount
- at the discretion of
- a piss_a_bed
- acanthocephala
- ardennes
- art tatum
- apteral
- apterous
- atriopexy
- alcian blue
- a gazette
- a classic (work)
- adenoma
- an anatomist
- a series of books
- algometric
- ambulant plague
- amorph
- appall
- appalachians
- a form of mutual salutation
- a sanction
- a discord to be created
- amorousness
- appal
- app
- appalachia
- apalachicola
- abel tasman
- aleksey maksimovich peshkov
- aleksey maximovich peshkov
- alessandro manzoni