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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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Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

experimental group in Medicine

experimental group

(ĭk-spĕr′ə-mĕntl)
n.
  1. A group of subjects that are exposed to the variable of a control experiment.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.