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Powered by Dorland's Medical Dictionary for Healthcare Consumers |
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oil (oil) an unctuous, combustible substance that is liquid, or easily liquefiable on warming, and is not miscible with water, but is soluble in ether. Such substances, depending on their origin, are classified as animal, mineral, or vegetable oils. Depending on their behavior on heating, they are classified as either volatile or fixed. a fat that is liquid at room temperature. essential oil
volatile o. expressed oil
, fatty oil
, fixed oil
one that is not volatile (does not evaporate on warming); such oils consist of a mixture of fatty acids and their esters, and are classified as solid, semisolid, and liquid, or as drying, semidrying, and nondrying as a function
of their tendency to solidify on exposure to air. volatile oil
an oil that evaporates readily; such oils occur in aromatic plants, to which they give odor and other characteristics.
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