ef·fec·tor

[ih-fek-ter]
noun
1.
Also, effecter. a person or thing that effects.
2.
Physiology. an organ or cell that carries out a response to a nerve impulse.
3.
Biochemistry. a substance, as a hormone, that increases or decreases the activity of an enzyme.

Origin:
1595–1605; < Latin, equivalent to effec- variant stem of efficere (see effect) + -tor -tor

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Based on the Random House Dictionary, © Random House, Inc. 2013.
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Collins
World English Dictionary
effector or effecter (ɪˈfɛktə) [Click for IPA pronunciation guide]
 
n
physiol a nerve ending that terminates in a muscle or gland and provides neural stimulation causing contraction or secretion
 
effecter or effecter
 
n

Collins English Dictionary - Complete & Unabridged 10th Edition
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00:10
Effector is always a great word to know.
So is organ system. Does it mean:
composed of two or more different organs that work together to provide a common function
self-regulatory biological system in which the output affects the input either positivelynegatively
American Heritage
Medical Dictionary

effector ef·fec·tor (ĭ-fěk'tər)
n.

  1. A muscle, a gland, or an organ capable of responding to a stimulus, especially a nerve impulse.

  2. A nerve ending that carries impulses to a muscle, a gland, or an organ and activates muscle contraction or glandular secretion.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Example sentences
In hyperthermia all the effector processes are stained to the utmost, whereas in fevers they are not.
Consider that an if-then logic statement is nothing but a sensor connected to an effector.
But to work, these effector proteins need to first make their way inside of a cell.
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