1 [sahy-muh]
noun Geology.
an 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

simatic [sahy-mat-ik] , adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
sima (ˈsaɪmə)
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
[C20: from si(lica) + ma(gnesia)]

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