Etymology
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grenade (n.)

"small explosive shell," thrown rather than discharged from a cannon, 1590s, earlier "pomegranate" (1520s), from French grenade "pomegranate" (16c.), earlier grenate (12c.), from Old French pomegrenate (see pomegranate). Form influenced by Spanish granada. So called because the many-seeded fruit suggested the powder-filled, fragmenting bomb, or from similarities of shape. See pomegranate. Much used late 17c., they went out of use 18c. but were revived 20c.

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Definitions of grenade

grenade (n.)
a small explosive bomb thrown by hand or fired from a missile;
From wordnet.princeton.edu