grotto

noun
🔊/ˈɡrɒtəʊ/
🔊/ˈɡrɑːtəʊ/
(plural grottoes, grottos)
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  1. a small cave, especially one that has been made artificially, for example in a garden洞穴;(尤指园林等中的)石窟
    Word Originearly 17th cent.: from Italian grotta, via Latin from Greek kruptē ‘a vault’, from kruptos ‘hidden’.