'ejaculatory' originates from Latin, specifically from the verb 'iaculārī' (related forms 'iaculare'/'iaculatus'), where the root 'iacul-' meant 'to throw' and the prefix 'e-' (from 'ex-') meant 'out'.

'ejaculatory' developed via Late/Medieval Latin forms such as 'ejaculari' and through the English verb 'ejaculate' (borrowed in the 17th century) and eventually formed the adjective 'ejaculatory' in modern English.

Initially it meant 'to throw out' (a physical throwing), but over time it evolved into meanings of 'sudden emission or discharge' (including semen emission) and by extension 'a sudden utterance or exclamation'.