resin

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun Any of numerous clear to translucent yellow or brown, solid or semisolid, viscous substances of plant origin, such as copal, rosin, and amber, used principally in lacquers, varnishes, inks, adhesives, plastics, and pharmaceuticals. Resins are usually insoluble in water.
• noun Any of numerous physically similar polymerized synthetics or chemically modified natural resins including thermoplastic materials such as polyvinyl, polystyrene, and polyethylene and thermosetting materials such as polyesters, epoxies, and silicones that are used with fillers, stabilizers, pigments, and other components to form plastics.
• transitive verb To treat or rub with resin.

from The Century Dictionary.

• To treat, rub, or coat with resin.
• noun A hardened secretion found in many species of plants, or a substance produced by exposure of the secretion to the air.
• noun The precipitate formed by treating a tincture with water.
• noun See rosin, 2.

from the GNU version of the Collaborative International Dictionary of English.

• noun Any one of a class of yellowish brown solid inflammable substances, of vegetable origin, which are nonconductors of electricity, have a vitreous fracture, and are soluble in ether, alcohol, and essential oils, but not in water; specif., pine resin (see rosin).
• noun Any of various polymeric substance resembling the natural resins[1], prepared synthetically; -- they are used, especially in particulate form, in research and industry for their property of specifically absorbing or adsorbing substances of particular types; they are especially useful in separation processes such as chromatography.
• noun (Min.) a fossil resin resembling copal, occuring in blue clay at Highgate, near London.
• noun (Bot.) a low composite shrub (Euryops speciosissimus) of South Africa, having smooth pinnately parted leaves and abounding in resin.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun A viscous hydrocarbon secretion of many plants, particularly coniferous trees.
• noun Any of various yellowish viscous liquids or soft solids of plant origin; used in lacquers, varnishes and many other applications; chemically they are mostly hydrocarbons, often polycyclic.
• noun Any synthetic compound of similar properties.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun any of a class of solid or semisolid viscous substances obtained either as exudations from certain plants or prepared by polymerization of simple molecules