- atelelosis
- athalposis
- athermancy
- athermic
- atheromatous abscess
- atherosclerosis
- athyreosis
- atlantooccipital membrane
- applicator
- apposition
- approximal
- aprosexia
- aptitude test
- apus
- apyrogenic
- aquapuncture
- aqueous solution
- arabinose
- arache
- arachnidism
- Aralia
- archibiastomae
- archigonocyte
- archiplasm
- archocystosyrinx
- archoptosis
- arcuate scotoma
- area subcallosa
- areolar
- argyrophil
- arhinia
- ariboflavinosis
- aridauxesis
- aristogenesis
- arrhenogenic
- arrhythmokinesis
- arsenious
- artefact
- arteria appendicularis
- arteria coellaca
- arteria episclerales
- arteria lingualis
- arteria pancreaticoduodenalissuperior
- arteria poplitea
- arteria sublingualis
- arteria suprascapularis
- arteria thoracoacromialis
- arteriae lieae
- arteriae perforantes
- arteriae thymicae
- arterial network
- arterial sulci
- arterial vein
- arteriogram
- arteriolitis
- arteriosclerosis
- arterious bleeding
- arthritic
- arthritis
- arthroplasty
- arthrotomy
- articular fracture
- Aristolochia
- arm rest
- army doctor
- arrhythmia
- arteria acetabull
- arteria buccalis
- arteria cystica
- arteria iliolumbalis
- arteria labyrinthi
- arteria ovarica
- arteria perinealis
- arteria sternocieldomastoidea
- arteria subscapularis
- arterial systole
- arteriectomy
- arteriography
- arteriole
- arteriolosclerosis
- arteriostenosis
- arteriovenous anastomosis
- arteritis umbilicalis
- artficial alkaloid
- arthritic atrophy
- arthropathy
- artificiaia parthenogenesis
- artificial eye
- artificial insemination
- artificial lung
- artificial tetanus
- arytenoid cartilage
- asbestosis
- ascariasis
- asciti fluid
- asepsis
- aseptic worm
- aspermia
- aspiration pneumonia
- assay