glyc·er·in / ˈglisərin/ (also glyc·er·ine / -rin; -ˌrēn; ˌglisəˈrēn/ ) • n. another term for glycerol.

glycerin (glycerol) (glis-er-in) n. a clear viscous liquid obtained by hydrolysis of fats and mixed oils and produced as a by-product in the manufacture of soap. It is used as an emollient in many skin preparations, as a laxative (particularly in the form of suppositories), and as a sweetening agent in the pharmaceutical industry.