sial

[ sahy-al ]
/ ˈsaɪ æl /

noun Geology.

the assemblage of rocks, rich in silica and alumina, that comprise the continental portions of the upper layer of the earth's crust.

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Origin of sial

1920–25; < German, equivalent to Si(licium) silicium + Al(uminium) aluminum

OTHER WORDS FROM sial

si·al·ic, adjective
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020

Example sentences from the Web for sial

British Dictionary definitions for sial

sial
/ (ˈsaɪəl) /

noun

the silicon-rich and aluminium-rich rocks of the earth's continental upper crust, the most abundant individual rock being granite

Derived forms of sial

sialic (saɪˈælɪk), adjective

Word Origin for sial

C20: si (licon) + al (uminium)
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