| Word | Definitions | Synonyms |
|---|---|---|
| aether | (noun) a medium that was once supposed to fill all space and to support the propagation of electromagnetic waves | Synonyms: ether |
| aetiologist | (noun) a specialist in the etiology of diseases | Synonyms: etiologist |
| aetiology | (noun) the philosophical study of causation | Synonyms: etiology |
| (noun) the cause of a disease | Synonyms: etiology |