| Word | Definitions | Synonyms |
|---|---|---|
| onager | (noun) Asiatic wild ass | Synonyms: Equus hemionus |
| (noun) small catapult used by the Romans | - | |
| onanism | (noun) manual stimulation of the genital organs (of yourself or another) for sexual pleasure | Synonyms: masturbation |
| (noun) a method of birth control in which coitus is initiated but the penis is deliberately withdrawn before ejaculation | Synonyms: coitus interruptus, pulling out, withdrawal, withdrawal method | |
| onanist | (noun) a person who practices masturbation | Synonyms: masturbator |