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say it: i-FEK-tur
effector is a noun meaning "one who brings about a result or event; one who accomplishes a purpose". It carries 3 recorded senses.
a nerve fiber that terminates on a muscle or gland and stimulates contraction or secretion
an organ (a gland or muscle) that becomes active in response to nerve impulses
Forms marked · are formed by the regular rule rather than recorded in the source data. English keeps a few hundred irregulars and the rest follow the pattern, so the rule is right far more often than not — but it is a rule, and the mark says so.
Definitions, synonyms and semantic relations for effector come from Princeton University’s WordNet. The pronunciation comes from the CMU Pronouncing Dictionary. Commonness is measured against a corpus of everyday English. Full sources and licences.