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单词 betula
释义

Betula


Thesaurus
Noun1.Betula - a genus of trees of the family Betulaceae (such as birches)Betula - a genus of trees of the family Betulaceae (such as birches)genus Betulahamamelid dicot genus - genus of mostly woody relatively primitive dicotyledonous flowering plants with flowers often unisexual and often borne in catkinsBetulaceae, birch family, family Betulaceae - monoecious trees and shrubs (including the genera Betula and Alnus and Carpinus and Corylus and Ostrya and Ostryopsis)birch tree, birch - any betulaceous tree or shrub of the genus Betula having a thin peeling barkBetula alleghaniensis, Betula leutea, yellow birch - tree of eastern North America with thin lustrous yellow or grey barkAmerican white birch, Betula cordifolia, Betula papyrifera, canoe birch, paper birch, paperbark birch - small American birch with peeling white bark often worked into e.g. baskets or toy canoesAmerican gray birch, American grey birch, Betula populifolia, gray birch, grey birch - medium-sized birch of eastern North America having white or pale grey bark and valueless wood; occurs often as a second-growth forest treeBetula pendula, common birch, European white birch, silver birch - European birch with silvery white peeling bark and markedly drooping branchesBetula pubescens, downy birch, white birch - European birch with dull white to pale brown bark and somewhat drooping hairy branchesBetula nigra, red birch, river birch, black birch - birch of swamps and river bottoms throughout the eastern United States having reddish-brown barkBetula lenta, black birch, cherry birch, sweet birch - common birch of the eastern United States having spicy brown bark yielding a volatile oil and hard dark wood used for furnitureBetula neoalaskana, Yukon white birch - Alaskan birch with white to pale brown barkBetula fontinalis, mountain birch, swamp birch, water birch, Western birch, Western paper birch - birch of western United States resembling the paper birch but having brownish barkAmerican dwarf birch, Betula glandulosa, Newfoundland dwarf birch - small shrub of colder parts of North America and Greenland

Betula


Betula

[′bech·ə·lə] (botany) The birches, a genus of deciduous trees composing the family Betulaceae.

betula


bet·u·la

(bet'ū-lă), European white birch, bark and leaves of Betula alba (family Betulaceae); native to Europe, northern Asia, and North America, north of Pennsylvania. It contains betulin (betula camphor), betuloresinic acid, volatile oil, saponins, betulol (sesquiterpine alcohol), apigenin, dimethyl ether, betuloside, gaultherin, methyl salicylate, and ascorbic acid; has odor of wintergreen and is used as a pharmaceutic aid (flavor/aromatic).
A tree containing betulinol, glycosides, flavonoids, saponins, sesquiterpenes, tannins, volatile oil—e.g., betulin
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