[im-yuh-noh-uh-sey, -as-ey, ih-myoo-]
any laboratory method for detecting a substance by using an antibody reactive with it.

1955–60; immuno- + assay

immunoassayable, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
immunoassay (ˌɪmjʊnəʊˈæseɪ)
immunol a technique of identifying a substance by its ability to bind to an antibody

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American Heritage
Medical Dictionary

immunoassay im·mu·no·as·say (ĭm'yə-nō-ās'ā, ĭ-myōō'-)
A laboratory or clinical technique that uses the specific binding between an antigen and its homologous antibody to identify and quantify a substance in a sample. Also called immunochemical assay.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
immunoassay   (ĭm'yə-nō-ās'ā, ĭ-my'-)  Pronunciation Key 
A laboratory technique that identifies and quantifies (usually in minute amounts) a protein such as a hormone or an enzyme, based on its ability to act as an antigen or antibody in a chemical reaction.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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