"small flat nail having instead of a head a slight projection on one side," late 13c., brod, from Old Norse broddr "spike, point, arrow," from Proto-Germanic *brozda- (source also of Old English brord "point, prick, blade of grass," Old High German brort "point, edge, crown"), from PIE *bhrs-dh-, from root *bhars- "projectile, point, bristle" (see bristle (n.)).
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