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experimental group

noun
1.
(in an experiment or clinical trial) a group of subjects who are exposed to the variable under study:
a lower infection rate in the experimental group that received the vaccine.
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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experimental-group in Medicine

experimental group ex·per·i·men·tal group (ĭk-spěr'ə-měn'tl)
n.
A group of subjects that are exposed to the variable of a control experiment.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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