from The American Heritage® Dictionary of the English Language, 4th Edition
- n. The sum of the atomic weights of all the atoms in a molecule. Also called formula weight.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. the sum of the atomic weights of every atom in a molecule
from the GNU version of the Collaborative International Dictionary of English
- adj. the weight of a molecule of any gas or vapor as compared with the hydrogen atom having weight of 1 as a standard; the sum of the atomic weights of the constituents of a molecule. For more precise measurements, the weight of the carbon isotope carbon-12 is used as the standard, that isotope having the value of 12.000. In this systen, now used almost universally, the hydrogen atom has a weight of 1.0079.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. (chemistry) the sum of the relative atomic masses of the constituent atoms of a molecule
Sorry, no etymologies found.
Ribonucleic acid, a nucleic acid of high molecular weight that synthesizes proteins and acts in cell replication.
This extract had a molecular weight twice that of the extracts used by Hughes, Terenius, and Snyder, but all were peptides made up from amino acids.
Lars Terenius and Agneta Wahlstrom stated that they had isolated a material with the same molecular weight from the cerebral spinal fluid of nonaddicted humans.