Definitions

from The American Heritage® Dictionary of the English Language, 5th Edition.

  • noun A substance used in a chemical reaction to detect, measure, examine, or produce other substances.

from The Century Dictionary.

  • noun In experimental psychology: The observer in any form of psychological experiment: opposed to experimenter.
  • noun Same as reactor.
  • noun One who or that which exerts reflex action or influence; an agency that produces reciprocal effects; a cause or source of counter-results.
  • noun In chem., a substance used to effect chemical change in another substance for the purpose of identifying its component parts or of ascertaining its percentage composition.
  • noun Anything used for the treatment of a substance under investigation to render its nature or condition more evident.

from the GNU version of the Collaborative International Dictionary of English.

  • noun (Chem.) A substance capable of producing with another a reaction, especially when employed to detect the presence of other bodies; a test.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • noun chemistry A usually available or readily made compound or known mixture of compounds used to treat materials, samples, other compounds or reactants in a laboratory or sometimes an industrial setting.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • noun a chemical agent for use in chemical reactions

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