American Heritage® Dictionary of the English Language, Fourth Edition
- n. The sum of the atomic weights of all the atoms in a molecule. Also called formula weight.
GNU Webster's 1913
- adj. (Chem.) 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.
- n. (chemistry) the sum of the relative atomic masses of the constituent atoms of a molecule
“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.”
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