Definition from Wiktionary, the free dictionary
Middle English, from Old French javelline, diminutive of javelot, from Celtic *gablakko- (Old Irish gabul, Welsh gafl). Also borrowed into Middle Low German as gaveline, and into Middle High German as gabilot.
javelin (plural javelins)
- A light spear thrown with the hand and used as a weapon.
- Flies the javelin swifter to its mark, / Launched by the vigour of a Roman arm?
- A metal-tipped spear thrown for distance in an athletic field event.
Derived terms 
spear used as a weapon
spear used in athletic competition
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