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From The Collaborative International Dictionary of English v.0.48:
Crypt \Crypt\ (kr[i^]pt), n. [L. crypta vault, crypt, Gr. kry`pth, fr. kry`ptein to hide. See Grot, Grotto.] 1. A vault wholly or partly under ground; especially, a vault under a church, whether used for burial purposes or for a subterranean chapel or oratory. [1913 Webster] Priesthood works out its task age after age, . . . treasuring in convents and crypts the few fossils of antique learning. --Motley. [1913 Webster] My knees are bowed in crypt and shrine. --Tennyson. [1913 Webster] 2. (Anat.) A simple gland, glandular cavity, or tube; a follicle; as, the crypts of Lieberk["u]hn, the simple tubular glands of the small intestines. [1913 Webster]