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assay

1. 
a. an analysis, esp a determination of the amount of metal in an ore or the amounts of impurities in a precious metal
b. (as modifier): an assay office
2. a substance undergoing an analysis
3. a written report on the results of an analysis
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005

assay

[′a‚sā]
(analytical chemistry)
Qualitative or quantitative determination of the components of a material, as an ore or a drug.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
References in periodicals archive ?
(13) In defence of natural science and its endeavour, and in defiance of the religious doctrine, Galileo wrote the book The Assayer (1623) which contains the well-known passage (quoted in Joseph):
Inside the Nugget casino, the bartender told me she moonlighted as an assayer. Bob Shawn, a round man with a ponytail and walrus mustache, overheard us.
The elements of the Galilean revolution Fletcher emphasizes (citing en passant The Assayer, The Sidereal Messenger, and Dialogue Concerning the Two Chief World Systems) include Galileo's epochal reimagining of the Book of the World as one written in mathematical symbols; his equally epochal positing of inertia as the key to understanding the local motion of bodies, including planetary ones; his positing of motion as the critical problem for "philosophy" in his time; his factoring in of the relative viewing position, hence the detached observer--hence the telescope and the microscope--to the production of scientific knowledge.
If Rampersad the researcher-chronicler is praiseworthy for the most part, Rampersad the assayer of behavior engenders some questions.
They concur with recent refutations of Pietro Redondi's views and focus on recently revealed documents they attribute to the Jesuit Melchior Inchofer, who was asked by Inquisitors to consider whether passages in Galileo's Assayer exposed the astronomer to charges of heresy.
Lieber's main claim to fame may be his book The Assayer's Guide, first published in 1852 after mineral discoveries in California brought wide attention to mining.
In 1905, Freeman was practising as an assayer and conducting a cyanide plant near Coolgardie, which he himself specially designed and equipped.
He pointed out that the last mention of atomism was in Galileo's Assayer, published in 1623, but Galileo's condemnation occurred a decade later in 1633.
Merely remodeling a cramped assayer's office took until April 3, 1854, and the branch mint's operations were slow and careful thereafter.
(Pound's father worked in Philadelphia as an assayer at the U.S.
The editor of the Encyclopedia of Spanish Silver helped identify the markings on the large number of silver spoons, revealing them as assayer's marks, the place of manufacture and the stamp that indicated tax had been paid.