molecular weight
noun
: the average mass of a molecule of a compound compared to ¹/₁₂ the mass of carbon 12 and calculated as the sum of the atomic weights of the constituent atoms
Examples of molecular weight in a Sentence
Recent Examples on the Web
It’s formulated with hydrolyzed proteins, which are composed of low molecular weight peptides that can be absorbed in the digestive tract to reduce risk of triggering an immune reaction.
—
Amber Smith, Discover Magazine, 17 Oct. 2022
Delta 8 has a molecular weight of 314.47 g/mol and a boiling point of 175-178°C (347-352°F).
—Amber Smith, Discover Magazine, 3 Sep. 2023
The condition is typically treated with aspirin and low molecular weight heparin (LMWH) during pregnancy.
—Sadia Rafiquddin, STAT, 31 Aug. 2023
With that in mind, a formula with two different molecular weights of hyaluronic acid can penetrate more optimally and promote longer-lasting hydration.
—Jessie Quinn, Peoplemag, 4 Aug. 2023
Molecular Weight For a more potent hyaluronic acid serum, Dr. Engelman recommends considering molecular weight.
—Jessie Quinn, Peoplemag, 4 Aug. 2023
The point of this was twofold: the smaller molecular weight allows the product to penetrate deeper into the hair strand.
—Megan Decker, refinery29.com, 31 May 2023
Their results showed that, for relatively small molecules, the assembly index is roughly proportional to molecular weight.
—Philip Ball, Quanta Magazine, 4 May 2023
Each capsule has 120 mg of this low molecular weight hyaluronic acid which is the type and amount shown in studies to provide skin health benefits.12 Ceratiq: Probably not as popular as hyaluronic acid for skin health, this ingredient comes from wheat oil extract.
—Holly Klamer, Ms, Verywell Health, 4 May 2023
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Amber Smith, Discover Magazine, 17 Oct. 2022
Delta 8 has a molecular weight of 314.47 g/mol and a boiling point of 175-178°C (347-352°F).
—Amber Smith, Discover Magazine, 3 Sep. 2023
The condition is typically treated with aspirin and low molecular weight heparin (LMWH) during pregnancy.
—Sadia Rafiquddin, STAT, 31 Aug. 2023
With that in mind, a formula with two different molecular weights of hyaluronic acid can penetrate more optimally and promote longer-lasting hydration.
—Jessie Quinn, Peoplemag, 4 Aug. 2023
Molecular Weight For a more potent hyaluronic acid serum, Dr. Engelman recommends considering molecular weight.
—Jessie Quinn, Peoplemag, 4 Aug. 2023
The point of this was twofold: the smaller molecular weight allows the product to penetrate deeper into the hair strand.
—Megan Decker, refinery29.com, 31 May 2023
Their results showed that, for relatively small molecules, the assembly index is roughly proportional to molecular weight.
—Philip Ball, Quanta Magazine, 4 May 2023
Each capsule has 120 mg of this low molecular weight hyaluronic acid which is the type and amount shown in studies to provide skin health benefits.12 Ceratiq: Probably not as popular as hyaluronic acid for skin health, this ingredient comes from wheat oil extract.
—Holly Klamer, Ms, Verywell Health, 4 May 2023
See More
These examples are programmatically compiled from various online sources to illustrate current usage of the word 'molecular weight.' Any opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback about these examples.
Word History
First Known Use
1860, in the meaning defined above
Dictionary Entries Near molecular weight
Cite this Entry
“Molecular weight.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/molecular%20weight. Accessed 8 Dec. 2023.
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Kids Definition
molecular weight
noun
: the weight of a molecule equal to the sum of the weights of the atoms contained in it
Medical Definition
molecular weight
noun
: the mass of a molecule that may be calculated as the sum of the atomic weights of its constituent atoms
More from Merriam-Webster on molecular weight
Britannica.com: Encyclopedia article about molecular weight
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