[noun koun-ter-steyn; verb koun-ter-steyn]Histology
verb (used with object)
to treat (a microscopic specimen) with a counterstain.
verb (used without object)
to become counterstained; take a counterstain.
Origin of counterstain
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
Examples from the Web for counterstain
Counterstain very lightly with aqueous solution of Neutral Red.
Counterstain in methylene blue, aqueous solution thirty seconds.
Counterstain with Kuehne's carbolic methylene-blue for one or two minutes.
to apply two or more stains in sequence to (a specimen to be examined), each of which colours a different tissue
(tr; usually passive) to apply (one of a series of stains) to a specimen to be examinedhaematoxylin 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
A stain of a contrasting color used to color the components in a microscopic specimen that are not made visible by the principal stain.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.