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单词 sima
释义

WordReference Random House Unabridged Dictionary of American English © 2024
si•ma1  (sī′mə),USA pronunciation n. [Geol.]
  1. Geologyan assemblage of rocks, rich in silica and magnesium, that constitutes the lower layer of the earth's crust and is found beneath the ocean floors and the sial of continents.
  • German (1909), equivalent. to Latin si(licium) silicium + ma(gnesium) magnesium
si•mat•ic  (sī mat′ik),USA pronunciation adj. 
si•ma2  (sī′mə),USA pronunciation n. [Archit.]
  1. Architecturethe uppermost member of a full classical order, usually a cyma recta, representing a roof gutter;
    cymatium.
  • variant of cyma

Collins Concise English Dictionary © HarperCollins Publishers::
sima /ˈsaɪmə/ n
  1. the silicon-rich and magnesium-rich rocks of the earth's oceanic crust, the most abundant individual rock being basalt
  2. the earth's continental lower crust, probably comprised of gabbro rather than basalt
Etymology: 20th Century: from si( lica) + ma( gnesia)
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更新时间：2024/11/10 7:53:21