from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. A muscle, gland, or organ capable of responding to a stimulus, especially a nerve impulse.
  • n. A nerve ending that carries impulses to a muscle, gland, or organ and activates muscle contraction or glandular secretion.
  • n. Biochemistry A small molecule that when bound to an allosteric site of an enzyme causes either a decrease or an increase in the activity of the enzyme.
  • n. Computer Science A device used to produce a desired change in an object in response to input.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. Any muscle, organ etc. that can respond to a stimulus from a nerve.
  • n. The part of a nerve that carries a stimulus to a muscle etc.
  • n. Any small molecule that effects the function of an enzyme by binding to an allosteric site.

from the GNU version of the Collaborative International Dictionary of English

  • n. An effecter.

from The Century Dictionary and Cyclopedia

  • n. See effecter.

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

  • n. one who brings about a result or event; one who accomplishes a purpose
  • n. a nerve fiber that terminates on a muscle or gland and stimulates contraction or secretion
  • n. an organ (a gland or muscle) that becomes active in response to nerve impulses


Sorry, no etymologies found.


  • She said the new findings reinforce the notion that V. para kills a host cell through the combined efforts of several so-called effector proteins working together rather than through the actions of a single protein. - latest science and technology news stories

  • This process is called effector triggered immunity (ETI).

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  • Its primary way of killing cancer cells is by eliciting an immune response, drawing what are known as effector cells (various types of killer white blood cells) to the tumor and activating them.

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  • Naive CD8, and CD62L expression is lost during the 'effector' phase.

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  • Professor Alan Cowman, head of the institute's Infection and Immunity division, said the parasite remodels the red blood cells by exporting hundreds of so-called 'effector' proteins into the cytoplasm of the red blood cell.

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  • But a few of these "effector" T cells survive and become memory T cells, ensuring that the immune system can respond faster and stronger the next time around.


  • In particular we identified a large number of so-called effector genes that are critical to pathogenesis that had been previously unknown and are extremely challenging to predict because of their small size and unusual structure. "


  • "effector" members of the IRG protein family such as Irga6, Irgb6 and Irgd

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  • In the first study, Satoshi Nishimura and colleagues from the University of Tokyo show that CD8+ effector T cells play an important role in macrophage recruitment and adipose tissue inflammation.

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  • Lorenz HP, Lin RY, Longaker MT, Whitby DJ, Adzick NS: The fetal fibroblast: The effector cell for scarless fetal skin repair.

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