- alcapton
- aqua fortis
- acid anhydrides
- acidulous
- acidic
- acerb
- acerbic
- acid fast
- arbalest
- anterior facial vein
- arbalist
- allure
- acquired
- absent
- assembly plant
- actual
- academician
- academic
- attenuate
- attenuated
- athletic facility
- adeptness
- adroitness
- assistant
- agent
- antihemophilic factor
- antihemophilic globulin
- accelerator factor
- antihaemophilic factor
- antihaemophilic globulin
- adequate
- agropyron cristatum
- attend to
- american beech
- alaskan brown bear
- Acheson process
- agitation
- american bittersweet
- abhenry
- absorption factor
- absorptivity
- altercate
- argufy
- american kestrel
- artistry
- arnica bud
- affiliate
- ammonia
- analgesic
- antidiabetic drug