Definitions from Wiktionary (grotto)

▸ noun:  A small cave.
▸ noun:  An artificial cavern-like retreat.
▸ noun:  A Marian shrine, usually built in a cavern-like structure.
▸ noun:  A local organization of cavers that typically organizes trips to caves and provides information and training for caving; a caving club.
▸ noun:  (Satanism) A secretive name for a local group of underground Satanists.
▸ noun:  (Philippines) A garden or roadside shrine with a small cave containing a statue of the Blessed Virgin Mary (usually Our Lady of Lourdes and sometimes paired with a water feature)

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