Dictionary.com

assay

[ verb a-sey; noun as-ey, a-sey ]
/ verb æˈseɪ; noun ˈæs eɪ, æˈseɪ /
Save This Word!
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

QUIZZES

QUIZ YOURSELF ON “ITS” VS. “IT’S”!

Apostrophes can be tricky; prove you know the difference between it’s and its in this crafty quiz!
Question 1 of 12
On the farm, the feed for chicks is significantly different from the roosters’; ______ not even comparable.

Origin of assay

1250–1300; Middle English <Middle French; variant of essay
as·say·a·ble, adjectiveas·say·er, nounun·as·sayed, adjectiveun·as·say·ing, adjective
assay , essay
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2021

British Dictionary definitions for assay

assay

verb (əˈseɪ)

noun (əˈseɪ, ˈæseɪ)

assayable, adjectiveassayer, noun
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

Medical definitions for assay

assay
[ ăsā′, ă-sā ]

n.

v.

The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.

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.
What's This Word?