Etymology
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weapon (n.)

Old English wæpen "instrument of fighting and defense, sword," also "penis," from Proto-Germanic *wēipna- (source also of Old Saxon wapan, Old Norse vapn, Danish vaaben, Old Frisian wepin, Middle Dutch wapen, Old High German wafan, German Waffe "weapon"), a word of unknown origin with no cognates outside Germanic; possibly a substratum word.

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Definitions of weapon

weapon (n.)
any instrument or instrumentality used in fighting or hunting;
he was licensed to carry a weapon
Synonyms: arm / weapon system
weapon (n.)
a means of persuading or arguing;
he used all his conversational weapons
Synonyms: artillery
From wordnet.princeton.edu