late 14c., from Old French resine "gum, resin," and directly from Latin resina "resin," from Greek rhetine "resin of the pine," of unknown origin.
resin res·in (rěz'ĭn)
Any of numerous clear to translucent yellow or brown, solid or semisolid, viscous substances of plant origin, such as copal, rosin, and amber.
Any of numerous physically similar polymerized synthetics or chemically modified natural resins including thermoplastic materials and thermosetting materials.
A precipitate formed by the addition of water to certain tinctures.