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The Collaborative International Dictionary of English v.0.48 (gcide)

fragmentation grenade \fragmentation grenade\ n. (Mil.)
A type of hand grenade designed to burst into multiple
fragments upon detonation of the explosive charge; the
fragments fly away at high velocity, killing or wounding
persons nearby. Contrasted to {concussion grenade}. The
common type of fragmentation grenade used by the American
military was sometimes jocosely referred to as a {pineapple}
from its reticulated surface appearance, resembling that of
the fruit.
[PJC]


Pineapple \Pine"ap`ple\, n. (Bot.)
A tropical plant ({Ananassa sativa}); also, its fruit; -- so
called from the resemblance of the latter, in shape and
external appearance, to the cone of the pine tree. Its origin
is unknown, though conjectured to be American.
[1913 Webster]