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Latin word gladius comes from Proto-Indo-European *kelh₂-, and later Proto-Celtic *kladiwos (Sword.)
*kelh₂- (Proto-Indo-European)
*kl̥h₂d- (Proto-Indo-European)
*kladiwos (Proto-Celtic)
Sword.
*kladyos (Gaulish)
gladius (Latin)
(figuratively) murder, death. (slang) penis. A gladiatorial contest. Sword. Swordfish.