Definition of grotto noun from the Oxford Advanced Learner's Dictionary

 

grotto

 noun
noun
BrE BrE//ˈɡrɒtəʊ//
 
; NAmE NAmE//ˈɡrɑːtoʊ//
 
(pl. grottoes, grottos)
 
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a small cave, especially one that has been made artificially, for example in a garden Word Origin early 17th cent.: from Italian grotta, via Latin from Greek kruptē ‘a vault’, from kruptos ‘hidden’.
See the Oxford Advanced American Dictionary entry: grotto