effector

Etymology
From.

Noun

 * 1)  Any muscle, organ etc. that can respond to a stimulus from a nerve.
 * 2)  The part of a nerve that carries a stimulus to a muscle etc.
 * 3)  Any small molecule that effects the function of an enzyme by binding to an allosteric site.
 * 4) An actuator.

Related terms

 * effect
 * effective
 * effectiveness
 * effectivity
 * effectome
 * effectorless
 * effectual
 * effectuate
 * efficacious
 * efficacity
 * efficacy
 * efficiency
 * efficient

Etymology
, perfect passive participle of

Noun

 * 1) an effecter, producer, cause