dil·​u·​ent ˈdil-yə-wənt How to pronounce diluent (audio)
: a diluting agent (such as the vehicle in a medicinal preparation)

Examples of diluent in a Sentence

Recent Examples on the Web To create your own at home, substitute broth for the water or whatever diluent your recipe calls for. Christina Montoya Fiedler, Better Homes & Gardens, 5 June 2023 The leak released about 30 barrels of diluent — used to dilute thick petroleum products for transport — into soil surrounding the line. Laura Schulte, Journal Sentinel, 9 Aug. 2022 Over-the-counter antigen tests from manufacturers including Abbott Labs and Quidel contain a diluent that users are instructed to mix with a sample collected from a nasal swab. Megan Cerullo, CBS News, 4 Jan. 2022 If too little or too much diluent, or reagent, is used, even that can deliver a false negative or positive result. Megan Cerullo, CBS News, 4 Jan. 2022 Depending on what formulation Pfizer produces pediatric doses in, that might require adding a different amount of diluent to each injection or using a different vial or syringe. Compiled Democrat-Gazette Staff From Wire Reports, Arkansas Online, 8 Oct. 2021 Some formulations of the Pfizer vaccine must be mixed with a solution, or diluent. Catherine Ho, San Francisco Chronicle, 16 Nov. 2021

These examples are programmatically compiled from various online sources to illustrate current usage of the word 'diluent.' Any opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback about these examples.

Word History


Latin diluent-, diluens, present participle of diluere

First Known Use

circa 1721, in the meaning defined above

Time Traveler
The first known use of diluent was circa 1721

Dictionary Entries Near diluent

Cite this Entry

“Diluent.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/diluent. Accessed 17 Jun. 2024.

Medical Definition


1 of 2 noun
dil·​u·​ent ˈdil-yə-wənt How to pronounce diluent (audio)
: a diluting agent (as the vehicle in a medicinal preparation)


2 of 2 adjective
: making thinner or less concentrated by admixture : diluting
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