weapon (n.) Look up weapon at Dictionary.com
Old English wæpen "instrument of fighting and defense, sword," also "penis," from Proto-Germanic *wæpnan (cognates: Old Saxon wapan, Old Norse vapn, Danish vaaben, Old Frisian wepin, Middle Dutch wapen, Old High German wafan, German Waffe "weapon"), from *webno-m, of unknown origin with no cognates outside Germanic.