| Name | Description |
|---|---|
| Anxiety | Restlessness. |
| Aperient | a mild laxative. |
| Aphrodisiac | a substance which stimulates sexual desire. |
| Aphthae | Small white pustules on the mucous membrane of the mouth. |
| Aphthosis | hoof and mouth disease. |
| Apoplexy | a loss of consciousness, sensation, and voluntary motion as a result of obstruction of arterial flow to the brain. |
| Appendicitis | inflammation of the appendix. |
| Appetzer | A substance, which increases the desire to take food. |
| Arrow poison | a substance used to poison arrows. |
| Arthritis | inflammation of the articulating surfaces of the joints. |
