Meaning

noun a melon vine of the genus Cucumis; cultivated from earliest times for its cylindrical green fruit

noun cylindrical green fruit with thin green rind and white flesh eaten as a vegetable; related to melons

originFrom Middle English cucumer, cucumber, from Old French cocombre, ultimately from Latin cucumis, cucumerem (possibly through an Old Occitan intermediate). Probably of Pre-Italic substrate origin. First attested in the late 14c. Displaced native English earthapple (see which for more), which has since acquired other senses.

Etymology from Wiktionary, CC BY-SA 3.0