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The Collaborative International Dictionary of English v.0.48 (gcide)

grotto \grot"to\ (gr[o^]t"t[-o]), n.; pl. {Grottoes}
(gr[o^]t"t[=o]z). [Formerly grotta, fr. It. grotta, LL.
grupta, fr. L. crypta a concealed subterranean passage,
vault, cavern, Gr. kry`pth, fr. krypto`s concealed, fr.
kry`ptein to conceal. Cf. {Grot}, {Crypt}.]
A natural covered opening in the earth; a cave; also, an
artificial recess, cave, or cavernlike apartment.
[1913 Webster]