Source : Webster's Revised Unabridged Dictionary (1913)

Putamen \Pu*ta"men\, n. [L.] (Bot.)
   The shell of a nut; the stone of a drupe fruit. See
   {Endocarp}.

Source : WordNet®

putamen
     n : the outer reddish part of the lenticular nucleus
     [also: {putamina} (pl)]