“+ noun
Etymology: International Scientific Vocabulary tri- + stearin
: the crystallizable triglyceride C 3 H 5 (OOCC 17 H 35 ) 3 of stearic acid reported especially in hard fats, formed by the hydrogenation of various unsaturated fats or triglycerides (as triolein), and used chiefly in textile sizes, polishing materials, and leather stuffing : glycerol tristearate