- aiai
- aid
- artist's model
- all fours
- ale drinker
- amoebic dysentery
- amebic dysentery
- American crayfish
- afterwards
- abaft
- apparent likeness
- a copy
- ampulla
- ambulacrum
- armguard
- aculeus
- appendicular skeleton
- advancing
- ankle brace
- acrobatic rickets
- antecedency
- antecedence
- access arm
- access
- access path
- access class
- access control
- anaerobic exercise
- arm exercise
- anechoic chamber
- anteroom
- alley
- alley cropping
- assisstant scretory
- assist
- advance (money to fix a deal)
- adust
- advance
- advance of money to cultivators
- at close range
- afoul
- afoul(
- aching
- aching fever
- aching sensation
- ache
- achalasia of pharyngooesopha_geal spincter
- acheilia
- anchorperson
- anchor chain