Definitions

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. Something that restrains
  • n. A chemical compound (such as potassium bromide), added to a developer to prevent fogging

from the GNU version of the Collaborative International Dictionary of English

  • n. One who, or that which, restrains.

from The Century Dictionary and Cyclopedia

  • n. One who or that which restrains; specifically, in photography, a chemical which is added to the developer for the purpose of retaṙding its action, especially in the case of an over-exposed plate, or in order to obtain greater contrast or intensity in a naturally weak plate. Acids, sodium sulphite, bromides, and other substances act as restrainers.
  • n. Specifically, in electricity, a substance used in the manufacture of the electrodes of magnetite arc-lamps the function of which is to reduce the rate at which the terminals are consumed.

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

  • n. a chemical that is added to a photographic developer in order to retard development and reduce the amount of fog on a film
  • n. a person who directs and restrains

Etymologies

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