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).
Any of various polymeric substance resembling the natural resins, 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; as, an ion-exchange resin.
Base for adhesives. Solid, semi-solid or pseudo-solid organic material which has an indefinite and often high molecular weight. Exhibits a tendency to flow when subject to stress.