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calcium metasilicate

American  
[met-uh-sil-i-kit, -keyt] / ˌmɛt əˈsɪl ɪ kɪt, -ˌkeɪt /

noun

  1. a white powder, CaSiO 3 , insoluble in water, used as an antacid and as a filler for paper.

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Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.