Un'der-crōft, n.

n. [From under, and Prov. Eng. croft, a vault, N. H. Ger. gruft, a vault, arched tomb, O. H. Ger. gruft, Lat. crypta, Gr. κρύπτη, from κρυπτός, concealed, from κρύπτειν, to conceal.] A vault under the choir or chancel of a church; also, a vault or secret walk under ground.