osmolality

noun

os·​mo·​lal·​i·​ty ˌäz-mō-ˈla-lə-tē How to pronounce osmolality (audio)
ˌäs-
plural osmolalities
: the concentration of an osmotic solution especially when measured in osmols or milliosmols per 1000 grams of solvent
osmolal
äz-ˈmō-ləl How to pronounce osmolality (audio)
äs-
adjective

Examples of osmolality in a Sentence

Recent Examples on the Web
Examples are automatically compiled from online sources to show current usage. Read More Opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback.
Yes, because of the osmolality of the carbs, whey, protein absorption, everything like that. — Greg Presto, Men's Health, 6 May 2022 Researchers also measured urine color and osmolality (for water concentration) and levels of plasma copeptin, a stable by-product of the hormone vasopressin. — New Atlas, 21 Aug. 2025 This led her to study the vaginal microbiome and develop Bio-Match® technology, formulations designed to mimic the body’s natural balance with osmolality and pH levels supportive of healthy flora. — Tanya Akim, Forbes.com, 11 June 2026

Word History

Etymology

osmol + -al entry 1 + -ity

First Known Use

circa 1944, in the meaning defined above

Time Traveler
The first known use of osmolality was circa 1944

Rhymes for osmolality

See All Rhymes for osmolality

Browse Nearby Words

osmol
osmolality
osmolarity
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Cite this Entry

“Osmolality.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/osmolality. Accessed 7 Jul. 2026.

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Medical Definition

osmolality

noun
os·​mo·​lal·​i·​ty ˌäz-mō-ˈlal-ət-ē, ˌäs- How to pronounce osmolality (audio)
plural osmolalities
: the concentration of an osmotic solution especially when measured in osmols or milliosmols per 1000 grams of solvent
osmolal
äz-ˈmō-ləl, äs- How to pronounce osmolality (audio)
adjective

More from Merriam-Webster on osmolality

Britannica.com: Encyclopedia article about osmolality

Last Updated: - Updated example sentences
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