Pronunciation (UK) IPA (key): /rɪˈsɛp.tə/ (US) IPA (key): /rɪˈsɛp.tɚ/ Audio (US)(file) Noun Singular receptor Plural receptors (countable) (medicine) A receptor is a protein on a cell wall that responds to sensory stimuli such as light or, heat.Wikiwand - on Seamless Wikipedia browsing. On steroids.Remove ads