
A fragmentation grenade (commonly known as frag or frag grenade) is an anti-personnel weapon that is designed to disperse small projectiles or fragments on detonation. The body may be made of hard plastic or steel. The outer casing and/or a fragmentation matrix consisting of notched wire and preformed fragments (spherical or otherwise) provide the...
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http://en.wikipedia.org/wiki/Fragmentation_grenade

(from the article `grenade`) ...that is long enough for the grenade to be accurately thrown but is too brief for enemy soldiers to toss the grenade back once it has landed among ...
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http://www.britannica.com/eb/a-z/f/54

a grenade with a heavy metal casing that shatters, on exploding, into fragments that travel at high speed and with great force.
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https://www.infoplease.com/dictionary/fragmentation-grenade
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