| A | B |
| anonymous | without a name; an-, without |
| antarctic | opposite the north or arctic; ant-, opposite + arktos, bear (the constellation Bear) |
| apostle | one who is sent off to preach the gospel; apo-, off |
| catastrophe | an overturning or turning against; cata-, against |
| aseptic | without infection or disease-causing bacteria; a-, without |
| antiseptic | (a substance) protecting against infection; anti-, against |
| amphitheater | a circular edifice with graduated rows of seats around an open space; amphi-, around |
| anesthetic | a substance that causes loss of sensation; an-, without |
| diameter | the line that passes from one side of a circle to another through the center; dia-, through, across |
| amoral | not moral, without morality; a-, not (moral is Latin) |
| catapult | a slingshot-like weapon that hurls a missle against something; cata-, against |
| anarchy | a political situation without any form of law or government; an-, without |