- assay medium
- assyriological
- ascites
- aseptic infarct
- asexual generation
- aspecific
- asporogenic
- association fiber
- asthemicapoplexy
- asthenic orthophoria
- asthma
- astigmatic amblyopia
- astigmatism
- astrictive
- astringent
- asymmetric karyotype
- atavism
- ataxic
- atelencephaly
- atheromatous ulcer
- atonic
- atony
- atopy
- atrabiliar
- atrabilious
- atresis
- atretic follum
- atrial rhythm
- atrioventricular interval
- atrophia cutis
- atrophia testic
- atrophic heart
- atrophic pharyngitis
- atrophic rhinitis
- atrophio laryngitis
- atropine
- arachnoid canal
- arachnoidvillus
- aralia cordata
- araneism
- archencephalon
- archepyon
- archosele
- arcus
- arcus iliopectineus
- ardent
- area centralis
- areometer
- argilla
- arhigosis
- arkyochrome
- army
- aromatic alcohol
- aromatic hydrocarbon
- arrhenoblastoma
- arteria axillaris
- arteria gastroduodenalis
- arteria hypogastrica
- arteria intestianles
- arteria lienalis
- arteria poronea
- arteria subciavia
- arterial pressure
- arteriolith
- arteriosclerotic parkinsonism
- arteriotomy
- arteritis
- artery
- arthrectomy
- Arthrography
- arthropod
- arthroscope
- articular muscle
- artificial
- artificial alimentation
- artificial anus
- artificial labor
- artificial pneumothorax
- artificial selection
- ascular nevus
- asexual dwarf
- asphyxia carbon
- asphyxy
- association
- astereognosis
- asthenic
- asthmatic
- astroblast
- asynclitism
- asynergia
- ataraxia
- ataxia
- atelectasis
- athelia
- atheroma
- athetosis
- athletic albuminuria
- athletic type
- atias
- atonic bladder