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sima

US/ˈsimʌ/ uncommon

noun

1.

rock that form the continuous lower layer of the earth''s crust; rich in silicon and magnesium

Origin

Coined by Eduard Suess in 1909, in Das Antlitz der Erde, as a blend of silicon + magnesium.

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WordNet 2.1 (Princeton University). Wiktionary (CC BY-SA). CMU Pronouncing Dictionary. WordNet 2.1 Copyright Princeton University. All rights reserved. Wiktionary content is available under the Creative Commons Attribution-ShareAlike Licence.