1. A compound of an essential oil and resin, present in certain plants. 2. A pharmaceutical preparation. See aspidium, capsicum, ginger. 3. SYN: balsam.
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oleo·res·in .ō-lē-ō-'rez-ən n
1) a natural plant product (as copaiba or turpentine) containing chiefly essential oil and resin
2) a preparation consisting essentially of oil holding resin in solution
oleo·res·in·ous -'rez-ən-əs, -'rez-nəs adj
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oleo·res·in (o″le-o-rezґin) [oleo- + resin] 1. any natural combination of a resin and a volatile oil, such as exudes from pines and other plants. 2. a compound prepared by exhausting a drug, containing both volatile oil and resin, by percolation with a volatile solvent, such as acetone, alcohol, or ether, and concentrating the percolate until the solvent has been dissipated.Medical dictionary. 2011.