Science Dictionary
bioassay   (bī'ō-ās'ā', -ā-sā')  Pronunciation Key 
  1. Determination of the relative purity of a substance, such as a drug or hormone, by comparing its effects with those of a standard preparation on a culture of living cells or a test organism.

  2. A test used to determine such purity.

The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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