resin: n. & v. --n. 1 an adhesive inflammable substance insoluble in water, secreted by some plants, and often extracted by incision, esp. from fir and pine (cf. GUM(1)). 2 (in full synthetic resin) a solid or liquid organic compound made by polymerization etc. and used in plastics etc. --v.tr. (resined, resining) rub or treat with resin. øøresinate n. resinate v.tr. resinoid adj. & n. resinous adj. [ME resyn, rosyn f. L resina & med.L rosina, rosinum]