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counterstain

[n. koun-ter-steyn; v. koun-ter-steyn] /n. ˈkaʊn tərˌsteɪn; v. ˌkaʊn tərˈsteɪn/
noun
1.
a second stain of a different color applied to a microscopic specimen and used to color and contrast those parts not retaining the first stain.
verb (used with object)
2.
to treat (a microscopic specimen) with a counterstain.
verb (used without object)
3.
to become counterstained; take a counterstain.
Origin
1890-1895
1890-95; counter- + stain
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for counter stain

counterstain

/ˈkaʊntəˌsteɪn/
verb (microscopy)
1.
to apply two or more stains in sequence to (a specimen to be examined), each of which colours a different tissue
2.
(transitive; usually passive) to apply (one of a series of stains) to a specimen to be examined haematoxylin is counterstained with eosin
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
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counter stain in Medicine

counterstain coun·ter·stain (koun'tər-stān')
n.
A stain of a contrasting color used to color the components in a microscopic specimen that are not made visible by the principal stain.


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