From The Collaborative International Dictionary of English v.0.44 [gcide]:
Longbow \Long"bow'\, noun The ordinary bow, not mounted on a stock; -- so called in distinction from the {crossbow} when both were used as weapons of war. Also, sometimes, such a bow of about the height of a man, as distinguished from a much shorter one.
{To draw the longbow}, to tell large stories.
From WordNet (r) 2.0 [wn]:
noun
1: a powerful wooden bow drawn by hand; usually 5-6 feet long; used in medieval England
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