Definition of sial in English:

sial

Line breaks: sial
Pronunciation: /ˈsʌɪəl
 
/

noun

[mass noun] Geology , • dated
  • The material of the upper or continental part of the earth’s crust, characterized as relatively light and rich in silica and alumina. Contrasted with sima.
    More example sentences
    • The rocks found in the crust of the continents is called sial.
    • A mnemonic term derived from for silica, for alumina, and for magnesium, applied as a compositional term to a layer within the Earth that occupies a position intermediate between sial and sima.

Origin

1920s: from the initial letters of silica and alumina.

More definitions of sial

Definition of sial in:

Get more from Oxford Dictionaries

Subscribe to remove adverts and access premium resources

Word of the day skosh
Pronunciation: skəʊʃ
noun
a small amount; a little