resinn.[F. rsine, L. resina; cf. Gr. "rhti`nh Cf. Rosin.] 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).()()2. 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; as, an ion-exchange resin.()Highgate resin (Min.), a fossil resin resembling copal, occuring in blue clay at Highgate, near London. -- Resin bush (Bot.), a low composite shrub (Euryops speciosissimus) of South Africa, having smooth pinnately parted leaves and abounding in resin.()