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Usage experts warn against confusing the verbs assay and essay. Some confusion shouldn’t be surprising; not only do the two somewhat uncommon words look and sound alike, they also come from the same root, the Middle French word essai, meaning "test" or "effort." (Essai, in turn, comes from the Late Latin word exagium, meaning "act of weighing.") At one time, the two terms were synonyms, sharing the meaning "try" or "attempt," but they are now typically differentiated, with essay meaning "to try or attempt" (as in "a comedic actor essaying her first dramatic role") and assay meaning "to test or evaluate" (as in "blood assayed to detect the presence of the antibody"). Of course, essay is more common as a noun referring to a short analytic or personal literary composition, but that’s another essay.
Examples of assay in a Sentence
Sarah K. Rich, Artforum, 1 Apr. 2025
For example, cell viability assays measure the effect of a chemical on cell survival and growth.
—Brad Reisfeld, The Conversation, 12 Mar. 2025
IEEE Spectrum, 29 Jan. 2013
But there is still much to learn about the actual fabrication costs of these assays, as well as practical properties like shelf life, sensitivity, and the reproducibility of their results.
—IEEE Spectrum, 29 Jan. 2013
See All Example Sentences for assay
Cite this Entry
“Assay.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/assay. Accessed 4 May. 2025.
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