- -aceus, -aceous: Of or pertaining to
- -al: Having character of
- -alexi: To ward off
- -algia: Pain
- -apsis: Juncture
- a-, an-: No, lacking, none
- ab-: Away from, out from
- abyss-: Deep, bottomless
- ac-: To, toward
- acou-: Hearing
- acr-, acro-: Extreme, peak
- actin-: A ray, spoke
- ad-: To, toward
- adeno-: Gland
- aero-: The air
- agri-: Field, soil
- alb-: White
- allo-: Other, different
- alto-: High
- ambi-: On both sides
- ameb-: Change, alteration
- amphi-, ampho-, amb-: Leading a double life, both
- an-: Not, without
- ana-: Up
- andro-: Masculine, man
- anemo-: Wind
- angio-: Vessel
- ante-: Before, ahead of time
- antero-: Front
- anth-: Flower
- anthropo-: Man
- anti-: Against
- ap-: To, toward
- apic-: Tip, end
- apo-: Off, away
- aqu-: Water
- arachn-: A spider
- arch-: Primitive, ancient
- arthro-: Joint
- aster-, astr-: Stars
- atom-: Vapor
- audi-: Hear
- auto-: Self
- aux-: Grow, enlarge