Source : Webster's Revised Unabridged Dictionary (1913)

Polygamia \Pol`y*ga"mi*a\, n. pl. [NL. See {Polygamous}.] (Bot.)
   (a) A Linn[ae]an class of plants, characterized by having
       both hermaphrodite and unisexual flowers on the same
       plant.
   (b) A name given by Linn[ae]us to file orders of plants
       having syngenesious flowers.