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cresol red in Medicine

cresol red

n.
  1. An acid-base indicator with pK value of 8.3; yellow at pH values below 7.4, red above 9.0.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.