Source : Webster's Revised Unabridged Dictionary (1913)

Tristearin \Tri*ste"a*rin\, n. [Pref. tri- + stearin.] (Physiol.
   Chem.)
   See {Stearin}.

Source : WordNet®

tristearin
     n : a triglyceride of stearic acid [syn: {glycerol tristearate}]