cu ‧ cum ‧ ber /ˈkjuːkʌmbə $ -ər/ BrE AmE noun [uncountable and countable]
[ Date: 1300-1400 ; Language: Old French ; Origin: cocombre , from Latin cucumis ]
a long thin round vegetable with a dark green skin and a light green inside, usually eaten raw ⇨ cool as a cucumber at ↑ cool 1 (3)