- anticlinal
- atrial natriuretic hormone
- a kind of large fish
- atrial complex
- alveo_labial
- alcosol
- an equivoque
- analytical model
- analytical sense
- antiperiodic
- a term of abuse generally used by women —cursed to a humiliated existence
- attunement
- an accessory organ
- anitschkow myocyte
- a sun_shed (esp. on a window)
- a superficial laugh
- a disastrous situation
- a huge frying pan
- allelopathy
- archaeologic
- a lute_player
- anisole
- antonio gaudi
- antonio gaudi i cornet
- amniotic
- amniogram
- amnioplastin
- ameloblast
- arsenical polyneuropathy
- a face as lovely as the moon
- an equilateral triangle
- a house of cards
- a sovereign power
- all kinds of
- a masterpiece
- all manner of
- an indologist
- a forecast
- anthropogeography
- allopsychic
- algebraic (al)
- at beck and call
- aprotein solvent
- achalasia
- a fact of life
- as far as the next man
- anteroventral
- arabonic acid
- amblyomma hebraeum
- a moghul