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The Collaborative International Dictionary

Polyandria \Pol`y*an"dri*a\, n. pl. [NL. See Polyandry.] (Bot.) A Linn[ae]an class of monoclinous or hermaphrodite plants, having many stamens, or any number above twenty, inserted in the receptacle.

Douglas Harper's Etymology Dictionary

1751 in botany; 1809 of human relationships, from poly- "many" andr-, stem of aner "man, husband" (see anthropo-) + -ia "condition of." Late Greek polyandria meant "populousness."