- abacterial
- abactio
- abactus venter
- abasia atactica
- abatement
- abater
- abbau
- abdominal
- abdominalgia
- abdominocystic
- abdominogenital
- abdominoscopy
- abdominothoracic
- abducensnerve
- abenteric
- aberrant thyroid
- aberratio
- abiogenesis
- abionarce
- abiophysiology
- abiotic
- abirritanttion
- ablastemic
- ablation
- abluent
- abmortal
- abnerval
- abneural
- abnormal
- ABO system
- abord
- abort
- abortionist
- abortive stamen
- abortus
- aboulia
- abrasio
- abrasor
- abreaction
- abruptio
- abruptio-placenta
- abscessed
- absidia
- absolute scale
- absolute scotoma
- absolute sterility
- absolute zero
- absorbent
- absorbing filter
- absorption apparatus