| oleaceous | (adjective) of or pertaining to or characteristic of trees or shrubs of the olive family | - |
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| oleaginous | (adjective) containing an unusual amount of grease or oil | Synonyms: greasy, oily, sebaceous |
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| (adjective) unpleasantly and excessively suave or ingratiating in manner or speech | Synonyms: buttery, fulsome, oily, smarmy, soapy, unctuous |
| oleaginousness | (noun) consisting of or covered with oil | Synonyms: greasiness, oiliness |
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| (noun) smug self-serving earnestness | Synonyms: fulsomeness, oiliness, smarminess, unction, unctuousness |
| oleander | (noun) an ornamental but poisonous flowering shrub having narrow evergreen leaves and clusters of fragrant white to pink or red flowers: native to East Indies but widely cultivated in warm regions | Synonyms: Nerium oleander, rose bay |
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| oleaster | (noun) any of several shrubs of the genus Elaeagnus having silver-white twigs and yellow flowers followed by olivelike fruits | - |
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| olecranon | (noun) process of the ulna that forms the outer bump of the elbow and fits into the fossa of the humerus when the arm is extended | Synonyms: olecranon process |
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| olefin | (noun) any unsaturated aliphatic hydrocarbon | Synonyms: alkene, olefine |
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| olefine | (noun) any unsaturated aliphatic hydrocarbon | Synonyms: alkene, olefin |
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| olein | (noun) a naturally occurring glyceride of oleic acid that is found in fats and oils | Synonyms: triolein |
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| oleo | (noun) a spread made chiefly from vegetable oils and used as a substitute for butter | Synonyms: margarin, margarine, marge, oleomargarine |
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| oleography | (noun) the art or process of producing chromolithographs printed on cloth to imitate an oil painting. | - |
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| oleomargarine | (noun) a spread made chiefly from vegetable oils and used as a substitute for butter | Synonyms: margarin, margarine, marge, oleo |
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| oleophilic | (adjective) having a strong affinity for oils rather than water | - |
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| oleophobic | (adjective) lacking affinity for oils | - |
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| oleoresin | (noun) a naturally occurring mixture of a resin and an essential oil; obtained from certain plants | - |
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