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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
Boasting three unique molecular weights of hyaluronic acid (HA), this serum includes macro HA for intensive hydration, micro HA for smooth skin texture, and micro-epidermic HA for fast product absorption.
—Conçetta Ciarlo, Vogue, 29 Nov. 2024
Molecular Weight For a more potent hyaluronic acid serum, Dr. Engelman recommends considering molecular weight.
—Jessie Quinn, People.com, 1 Nov. 2024
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, People.com, 1 Nov. 2024
There are four different molecular weights of hyaluronic acid in this formula, meaning the ingredient can penetrate the skin to different depths and create a volumizing effect at multiple levels of the skin.
—Emily Orofino, Allure, 29 Oct. 2024
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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 7 Dec. 2024.
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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