radioimmunoassay

ra·di·o·im·mu·no·as·say

[rey-dee-oh-im-yuh-noh-as-ey, -a-sey, -i-myoo-]
noun
a test procedure that integrates immunologic and radiolabeling techniques to measure minute quantities of a substance, as a protein, hormone, or drug, in a given sample of body fluid or tissue.

Origin:
1960–65; radio- + immunoassay

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Collins
World English Dictionary
radioimmunoassay (ˈreɪdɪəʊˌɪmjʊnəʊˈæseɪ) [Click for IPA pronunciation guide]
 
n
a sensitive immunological assay, making use of antibodies and radioactive labelling, for the detection and quantification of biologically important substances, such as hormone concentrations in the blood

Collins English Dictionary - Complete & Unabridged 10th Edition
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00:10
Radioimmunoassay has a plethora of syllables.
So is sesquipedalianism. Does it mean:
given to using long words.
the estimation of something as valueless (encountered mainly as an example of one of the longest words in the English language).
American Heritage
Medical Dictionary

radioimmunoassay ra·di·o·im·mu·no·as·say (rā'dē-ō-ĭm'yə-nō-ās'ā, -ĭ-my&oomacr;'-)
n.
Abbr. RIA
The immunoassay of a substance, such as a hormone or an enzyme that has been radiolabeled.

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
radioimmunoassay   (rā'dē-ō-ĭm'yə-nō-ās'ā, -ĭm-y'-)  Pronunciation Key 
An immunoassay in which the substance to be identified or quantified is labelled with a radioactive substance (called a tracer), such as an ion. See also immunoassay, tracer.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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