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  1  definition  found 
  From  Webster's  Revised  Unabridged  Dictionary  (1913)  [web1913]: 
  Didynamia  \Did`y*na"mi*a\,  n.  pl  [NL.,  fr  Gr  di-  =  di`s- 
  twice  +  ?  power.]  (Bot.) 
  A  Linn[ae]an  class  of  plants  having  four  stamens  disposed  in 
  pairs  of  unequal  length.