Meaning

noun the thick short innermost digit of the forelimb

noun the part of a glove that provides a covering for the thumb

noun a convex molding having a cross section in the form of a quarter of a circle or of an ellipse

originDerived from Middle English thombe, thoume, thoumbe (“thumb”), from Old English þūma (“thumb”), from Proto-West Germanic *þūmō (“thumb”), from Proto-Germanic *þūmô (“thumb”), from Proto-Indo-European *tūm- (“to grow”). Cognate with West Frisian tomme (“thumb”), Dutch duim (“thumb”), Low German Duum (“thumb”), German Daumen (“thumb”), Danish, Norwegian Bokmål, and Norwegian Nynorsk tomme (“inch”),…

Etymology from Wiktionary, CC BY-SA 3.0