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sial

[ sahy-al ]

noun

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


sial

/ ˈsaɪəl; saɪˈælɪk /

noun

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


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Derived Forms

  • sialic, adjective
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Other Words From

  • si·alic adjective
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Word History and Origins

Origin of sial1

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

Origin of sial1

C20: si ( licon ) + al ( uminium )
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Example Sentences

During the Mutiny of 1857 the Sial leader again proved his loyalty by serving in person on the British side.

Sialogogue, sī-al′o-gog, n. a drug which increases the secretion of saliva—also Sial′agogue.

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Siad Barresialadenitis