Entry 1 sense Webster, 1913 Triglyceride /trīg-lĭs'-ẽr-īdˌ/ · Tri·glyc·er·ide · IPA /tɹaɪˈɡlɪsəɹaɪd/ 01 n. A glyceride formed by the replacement of three hydrogen atoms in glycerin by acid radicals. 1. A glyceride formed by the replacement of three hydrogen atoms in glycerin by acid radicals.(Chem.)