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resin (n.)

hardened secretions of various plants, used in medicine, varnishes, etc., late 14c., from Old French resine "gum, resin," and directly from Latin resina "resin," from Greek rhetine "resin of the pine," a word of unknown origin. Applied to synthetic products by 1883. Related: Resiniferous.

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Definitions of resin from WordNet

resin (n.)
any of a class of solid or semisolid viscous substances obtained either as exudations from certain plants or prepared by polymerization of simple molecules;
Synonyms: rosin
From wordnet.princeton.edu