- anglophile
- a peach
- a commission agent
- a dare devil
- a sharp astute fellow
- and overseer's position or job
- acupuncturist
- achromycin
- arrogant behaviour
- arrogance inspired by opulence
- azotaemia
- adenomyosarcoma
- achivist
- anabaena
- anne
- antirrhinum coulterianum
- abney level
- abbe condenser
- abs
- ambulanceman
- ambulance worker
- amniocentesis
- arizona wild cotton
- ashtray
- aldehyde alcohol
- acetyl chloride
- acetyl
- as it is
- acetyl group
- acetyl radical
- acetin
- acetylenic
- acetone body
- acetaldol
- acetaldehyde
- acetamide
- acetate disk
- acinonyx jubatus
- acetylene
- ascii
- aster acuminatus
- aspic
- asbestosis
- atmospheric phenomenon
- a die
- Alca torda
- auklet
- augustus welby northmore pugin
- an arduous task
- aepyornis