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formula weight

American  

noun

Chemistry.

  1. (of a molecule) molecular weight.

  2. (of an ionic compound that does not form molecules) the sum of the atomic weights of the atoms of the formula unit.

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

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