| Word | Definitions | Synonyms |
|---|---|---|
| aboral | (adjective) opposite to or away from the mouth | - |
| aboriginal | (adjective) characteristic of or relating to people inhabiting a region from the beginning | Synonyms: native |
| (adjective) having existed from the beginning; in an earliest or original stage or state | Synonyms: primaeval, primal, primeval, primordial | |
| abortifacient | (adjective) causing abortion | - |
| abortive | (adjective) failing to accomplish an intended result | Synonyms: stillborn, unsuccessful |