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assay

[ verb a-sey; noun as-ey, a-sey ]
/ verb æˈseɪ; noun ˈæs eɪ, æˈseɪ /
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See synonyms for: assay / assayable / assayer on Thesaurus.com

verb (used with object)
verb (used without object)
to contain, as shown by analysis, a certain proportion of usually precious metal.
noun
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Origin of assay

1250–1300; Middle English <Middle French; variant of essay

OTHER WORDS FROM assay

as·say·a·ble, adjectiveas·say·er, nounun·as·sayed, adjectiveun·as·say·ing, adjective

WORDS THAT MAY BE CONFUSED WITH assay

assay , essay
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

How to use assay in a sentence

British Dictionary definitions for assay

assay

verb (əˈseɪ)
noun (əˈseɪ, ˈæseɪ)

Derived forms of assay

assayable, adjectiveassayer, noun

Word Origin for assay

C14: from Old Northern French assai; see essay
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Scientific definitions for assay

assay
[ ăsā, ə-sā ]

A quantitative determination of the amount of a given substance in a particular sample. Assays are regularly used to determine the purity of precious metals. They can be performed by wet methods or dry methods. In the wet method, the sample is dissolved in a reagent, like an acid, until the purified metal is separated out. In the dry method, the sample is mixed with a flux (a substance such as borax or silica that helps lower the melting temperature) and then the sample is heated to the point where impurities in the metal fuse with the flux, leaving the purified metal as a residue.
A bioassay.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
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