plural noun
Hy·​me·​no·​gas·​tra·​ce·​ae | \-(ˌ)nōˌgaˈstrāsēˌē\

Definition of Hymenogastraceae 

: a family of basidiomycetous fungi of the order Hymenogastrales forming subterranean irregularly globose sporophores — see false truffle, rhizopogon

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History and Etymology for Hymenogastraceae

New Latin, from Hymenogastr-, Hymenogaster, type genus (from hymen- + -gaster) + -aceae

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the figure or shape of a crescent moon

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