counter stain

counterstain

[n. koun-ter-steyn; v. koun-ter-steyn] Histology.
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:
1890–95; counter- + stain

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World English Dictionary
counterstain (ˈkaʊntəˌsteɪn)
 
vb
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

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American Heritage
Medical Dictionary

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.
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