What is the X in X-mas?
mid-14c., "chisel with a concave blade," from Old French gouge, from Late Latin gubia, alteration of gulbia "hollow beveled chisel," probably from Gaulish (cf. Old Irish gulban "prick, prickle," Welsh gylfin "beak").
1560s, "to cut with a gouge," from gouge (n.). Meaning "to force out with a gouge" (especially of the eyes, in fighting) attested by 1800. Meaning "swindle" is American English colloquial from 1826 (implied in plural noun gougers). Related: Gouged; gouging.
A strong curved chisel used in bone surgery.