molecular-weight

molecular weight

noun Chemistry.
the average weight of a molecule of an element or compound measured in units once based on the weight of one hydrogen atom taken as the standard or on 1/16 (0.0625) the weight of an oxygen atom, but after 1961 based on 1/12 (0.083) the weight of the carbon-12 atom; the sum of the atomic weights of all the atoms in a molecule. Abbreviation: mol. wt.
Also called formula weight.


Origin:
1875–80

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World English Dictionary
molecular weight
 
n
the former name for relative molecular mass

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Medical Dictionary

molecular weight n.
Abbr. mol wt, MW
The sum of the atomic weights of all the atoms in a molecule. Also called formula weight.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
molecular weight  
The sum of the atomic weights of the atoms contained in a molecule. Also called relative molecular mass.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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American Heritage
Cultural Dictionary
molecular weight [(muh-lek-yuh-luhr)]

The sum of the atomic weights of all the atoms in a molecule.

The American Heritage® New Dictionary of Cultural Literacy, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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