Research topic:essential oils

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essential oils

The Columbia Encyclopedia, Sixth Edition

essential oils volatile oils that occur in plants and in general give to the plants their characteristic odors, flavors, or other such properties. Essential oils are found in various parts of the plant body (in the seeds, flowers, bark, or leaves) and are also concentrated in certain special cells or groups of cells (glands). Because of their properties, they are widely used in perfumes, flavorings, and medicines. Their chemical composition differs: A great many, for example, are principally terpenes, compounds of carbon and hydrogen. Others contain aldehydes, ketones, or phenols. Oxygen, sulfur, and nitrogen are present in compounds in others. In general, they are complex mixtures. They are obtained from the plant in various ways, depending upon the nature of the part in which they occur—by compression, by distillation with steam, by dissolving the oils out (extraction) or absorbing them, and by pressure and maceration. Among the plants notable for their essential oils are members of the following plant families: carrot (e.g., anise, dill, angelica), ginger (cardamom), heath (wintergreen), laurel (cinnamon and camphor), mint (pennyroyal, peppermint, spearmint, thyme), myrtle (clove and eucalyptus), olive (jasmine and lilac), orchid (vanilla), pulse (acacia and sweet pea), rose (attar of roses and almond), and rue (lemon and other citrus plants).

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The Columbia Encyclopedia, Sixth Edition. Copyright 2008 Columbia University Press

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Related entries from encyclopedias, dictionaries, and thesauruses

essential oil
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essential oil
essential oil A natural oil with a distinctive scent secreted...aromatic plants. Terpenes are the main constituents. Essential oils are extracted from plants by steam distillation, extraction...perfumes, flavourings, and medicine. Examples are citrus oils, flower oils (e.g. rose, jasmine), and ... Read more
essential oil
essential oil n. a volatile oil derived from an aromatic plant. Essential oils are used in various pharmaceutical preparations. See also aromatherapy . Read more
oils, essential
oils, essential See essential oils . Read more
essential oils
essential oils Volatile, aromatic, or odoriferous oils found in plants and used for flavouring foods. Chemically distinct from the edible oils, since they are not glycerol esters. See also terpenes . Read more

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How to Blend Essential Oils to Ease Coughing

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