'jentacular' originates from Latin, specifically the word 'jentaculum' (classical 'ientaculum'), where 'ient-' (jent-) meant 'breakfast'.

'jentacular' changed from the Latin noun 'jentaculum' and the Neo-Latin/Latin adjective form 'jentacularis' and was later adopted into English as 'jentacular' with its adjectival sense.

Initially it referred to the noun 'breakfast' (the meal) in Latin, but over time it evolved into the English adjective meaning 'relating to breakfast'.