[n. koun-ter-steyn; v. koun-ter-steyn] Histology.
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)
to treat (a microscopic specimen) with a counterstain.
verb (used without object)
to become counterstained; take a counterstain.

1890–95; counter- + stain Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
counterstain (ˈkaʊntəˌsteɪn)
1.  to apply two or more stains in sequence to (a specimen to be examined), each of which colours a different tissue
2.  (tr; 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 10th Edition
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American Heritage
Medical Dictionary

counterstain coun·ter·stain (koun'tər-stān')
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
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