| A | B |
| access | capacity to enter or approach; to get at |
| axis | A line about which a revolving body turns or about which a structure would turn if it did revolve; the second cervical vertebra. |
| anuresis | Retention of urine in the bladder. |
| enuresis | The involuntary discharge of urine after the age at which urinary control should have been achieved. |
| acidic | Of or pertaining to an acid; acid-forming. |
| ascitic | Pertaining to or characterized by ascites: the effusion and accumulation of serous fluid in the abdominal cavity. |
| arthrectomy | The excision of a joint. |
| atherectomy | The excision of an atheromatous plaque (from an artery). |
| atonic | Lacking normal tone or strength. |
| atopic | Pertaining to atopy (a genetic predisposition toward the development of hypersensitivity reactions against common environmental antigens=allergies). |
| atoxic | Not poisonous; not due to a poison. |
| atrophic | Pertaining to or characterized by atrophy (wasting away; a diminution in the size of a cell, tissue, organ, or part.) |
| ectopic | Pertaining to or characterized by displacement or malposition; located away from normal position; arising from abnormal site or tissue. |