Source : Webster's Revised Unabridged Dictionary (1913)

Tetradynamian \Tet`ra*dy*na"mi*an\, n. (Bot.)
   A plant of the order Tetradynamia.

Tetradynamian \Tet`ra*dy*na"mi*an\, Tetradynamous
\Tet`ra*dyn"a*mous\, a. (Bot.)
   Belonging to the order Tetradynamia; having six stamens, four
   of which are uniformly longer than the others.