sial

American  

[sahy-al] / ˈsaɪ æl /

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.

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sial British  

/ 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

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Other Word Forms

• sialic
  adjective

Etymology

Origin of sial

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

Example Sentences

"They’re literally like, teenagers, thousands of miles away from their hometowns having to deal with this situation, which lawyers often fear to engage in," Sial said.

From Salon • May 25, 2025

Both Ms Reddy and Mr Sial said foreign students apply to go to college in the US because they see it as a welcoming place where opportunities abound.

From BBC • May 23, 2025

Sial said their success proved Australian nuclear scientists were able to stand on their own.

From Reuters • Feb. 3, 2023

Sial, who came to the U.S. from Pakistan 35 years ago, said he has worked with Buttigieg on development projects in the city and described the mayor as a “very honest, very fair guy.”

From Washington Times • Apr. 14, 2019

Mr. Sial was replaced two days later as TerraForm’s finance chief, filings show.

From The Wall Street Journal • Dec. 23, 2015