tetrandria

from The Collaborative International Dictionary of English v.0.48

Tetrandria \Te*tran"dri*a\, n. pl. [NL., from Gr. te`tra- (see
   {Tetra-}) + ?, ?, a man, male.] (Bot.)
   A Linnaean class of plants having four stamens.
   [1913 Webster] Tetrandrian