One of the mysteries of the English language finally explained.
Archaeology. Any of a number of stone artefacts, usually around 30 cms (12 inches) high, carved in the form of a mushroom cap supported by the figure of an animal, god, etc., found in Guatemala and occasionally elsewhere in Mesoamerica.
Mid 17th century (in an earlier sense). From mushroom + stone.
mushroom stone/ˈmʌʃrʊm ˌstəʊn//ˈmʌʃruːm ˌstəʊn/
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