formula weight
Americannoun
Chemistry.
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(of a molecule) molecular weight.
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(of an ionic compound that does not form molecules) the sum of the atomic weights of the atoms of the formula unit.
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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.
