Archaic or dialectal: a spear, lance, or pointed weapon; a blade or sword; sometimes used for a long pole weapon.
From Old French glaive, possibly from Latin gladius 'sword.' The word traveled through Norman-influenced English and survived in archaic and dialectal speech.
The word 'glaive' survived in fantasy games and medieval fiction because it sounds more exotic than 'spear,' but it's actually just an old English word that sounded too cool to forget completely.
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