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thuja <botany> A genus of evergreen trees, thickly branched, remarkable for the distichous arrangement of their branches, and having scalelike, closely imbricated, or compressed leaves.
Alternative forms: thuya See Thyine wood.
Thuja occidentalis is the Arbor vitae of the Eastern and Northern United States. T. Gigantea of North-waetern America is a very large tree, there called red cedar, and canoe cedar, and furnishes a useful timber. Thuja oil. Cedar leaf oil. Thujone. N. An oil, C10H16O, the chief constituent of cedar leaf oil. A stimulant similar to camphor. Also called thujol, thuyol, absinthol, thuyone, tanacetol, tanacetone.
Origin: NL, from Gr. An African tree with sweet-smelling wood.
Source: Websters Dictionary
(01 Mar 1998)
thuja oil Oil obtained by steam distillation from the fresh leaves of Thuja occidentalis; used as an insect repellent and counterirritant, and in perfumery.
Synonym: thuja oil.
(05 Mar 2000)
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