The Collaborative International Dictionary of English v.0.48:

Tetragynia \Tet`ra*gyn"i*a\, n. pl. [NL., fr. Gr. te`tra- (see
   Tetra-) + gynh` a woman, female.] (Bot.)
   A Linnaean order of plants having four styles.
   [1913 Webster] Tetragynian