- aphis
- aphonia
- aphonic
- aphonic pectoriloquy
- aphonous
- aphony
- aphorism
- aphorismic
- aphoristic
- aphose
- aphotic
- aphototropic
- aphototropism
- aphrenia
- aphrodisiac
- aphtha
- aphthae
- aphyllous
- aphyrous clay
- apian
- apiarian
- apiarist
- apiary
- apical
- apical abscess
- apical angle
- apical area
- apical bronchus
- apical fiber
- apical infection
- apical wood
- apicalabscess
- apicectomy
- apices
- apicoectomy
- apicolysis
- apiculate
- apiculiform
- apicultural
- apiculture
- apiculturist
- apiculus
- apiece
- apilary
- apileate
- apillover radiation
- apiologist
- apiology
- apiphobia
- apish
- apishness
- apisination
- apitoxin
- apituitarism
- apivorous
- apl
- aplacental
- aplanat
- aplanatic
- aplanatic lens
- aplanatism
- aplanetic
- aplanetism
- aplanitic focus
- aplanogamete
- aplanospore
- aplasia
- aplasmic
- aplastic anemia
- aplastic crisis
- aplatism
- aplenty
- aplerotic
- aplomb
- apnea
- apnea neonatorum
- apnoea
- apoapsis
- apobiosis
- apobiotic
- apocalypse
- apocalyptic
- apocalyptical
- apocalyptically
- apocarpous
- apocarteresis
- apocentric
- apochromat
- apochromatic
- apochromatic lens
- apochromatism
- apocope
- apocrine
- apocrypha
- apocryphal
- apocynaceous
- apocyte
- apod
- apoda
- apodal