GROTTO Meaning of GROTTO in English n. (pl. -oes or -os) 1. a small picturesque cave. 2 an artificial ornamental cave, e.g. in a park or large garden. Derivatives: grottoed adj. Etymology: It. grotta ult. f. L crypta f. Gk krupte CRYPT Oxford English vocab. Оксфордский английский словарь. 2012