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Papanicolaou stain

n.
  1. A multichromatic stain used principally on exfoliated cytologic specimens, giving great transparency and detail, and important in cancer screening, especially of smears of the female genital tract.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.