Source : Webster's Revised Unabridged Dictionary (1913)

Tetradynamia \Tet`ra*dy*na"mi*a\, n. pl. [NL., fr. Gr. te`tra-
   (see {Tetra-}) + ? power.] (Bot.)
   A Linn[ae]an class of plants having six stamens, four of
   which are longer than the others.