sial [sahy-al] ExamplesWord Origin 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.

Compare sima1. Origin of sial 1920–25; German, equivalent to Si(licium) silicium + Al(uminium) aluminum Related formssi·al·ic, adjective Examples from the Web for sial Historical Examples of sial

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

    Encyclopaedia Britannica, 11th Edition, Volume 15, Slice 4


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

    Chambers’s Twentieth Century Dictionary (part 4 of 4: S-Z and supplements)


  • British Dictionary definitions for sial sial noun

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

    Derived Formssialic (saɪˈælɪk), adjectiveWord Origin for sial C20: si (licon) + al (uminium)

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