Grenade
mid 16th century (in the sense ‘pomegranate’): from French, alteration of Old French ( pome) grenate (see pomegranate), on the pattern of Spanish granada . The bomb was so named because it supposedly resembled a pomegranate in shape.
wiktionary
Borrowed from French grenade, from Old French grenate in the phrase pomme grenate(“pomegranate”), ultimately from Medieval Latin pomum(“apple”) + granatum(“having grains”). The -d developed in French under influence of Spanish granada.
etymonline
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.
