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sima1

[sahy-muh]
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noun Geology.
  1. 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.
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Origin of sima1

< German (1909), equivalent to Latin si(licium) silicium + ma(gnesium) magnesium
Related formssi·mat·ic [sahy-mat-ik] /saɪˈmæt ɪk/, adjective
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
British Dictionary definitions for simatic

sima

noun
  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
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Derived Formssimatic (saɪˈmætɪk), adjective

Word Origin

C20: from si (lica) + ma (gnesia)
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012