plural noun
Gra·​min·​e·​ae | \grəˈminēˌē\

Definition of Gramineae 

: a large family of monocotyledonous plants (order Graminales) with culms hollow, leaves generally 2-ranked, and fruit a caryopsis — see grass — compare bamboo, cereal

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History and Etymology for Gramineae

New Latin, Latin, from feminine plural of gramineus

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