Main Entry: ¹black·jack

Pronunciation: \-ˌjak\

Function: noun

Date: 1591

1 [black + jack (vessel)] : a tankard for beer or ale usually of tar-coated leather
2 : sphalerite
3 : a hand weapon typically consisting of a piece of leather-enclosed metal with a strap or springy shaft for a handle
4 : an often scrubby oak (Quercus marilandica) chiefly of the southeastern United States —called also blackjack oak
5 : a card game the object of which is to be dealt cards having a higher count than those of the dealer up to but not exceeding 21 —called also twenty-one, vingt-et-un