sial: Meaning and Definition of

si•al

Pronunciation: (sī'al), [key]
— n. Geol.
  1. the assemblage of rocks, rich in silica and alumina, that comprise the continental portions of the upper layer of the earth's crust. Cf..
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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