- aurorean
- antares
- Addend
- Argentiferous
- Arose
- Amendatory
- Absent-minded
- Air-brake
- Approver
- Automatism
- Agelong
- Air-conditioner
- Airraid
- Antimatter
- Antiquities
- Attracting
- Albuminous
- Argosy
- Ambulate
- Anfractuous
- Acarid
- Acritical
- Activators
- Adduced
- Adhesions
- Ad-lib
- Adhesives
- Advective
- Advertisers
- Aerosols
- Afterpains
- Agonadal
- Agrypnia
- Air-condition
- Alchemists
- Aldermen
- Alkaloids
- Allopatric
- Alloying
- Altissimo
- Amphibians
- Anaphoric
- Anchoring
- Annalistic
- Antennae
- Antibodies
- Anticoagulative
- Antiparallel
- Aphagia
- Apochromatic