Merriam-Webster Logo
  • Dictionary
  • Thesaurus
  • Scrabble
  • Spanish Central
  • Learner's Dictionary

Medical Dictionary


noun ad·re·no·cep·tor \ə-ˈdrē-nə-ˌsep-tər\

Medical Definition of adrenoceptor

  1. :  any of a group of receptors on cell surfaces that are activated by epinephrine or norepinephrine :  an adrenergic receptor Adrenoceptors mediate certain physiological responses (such as vasodilation or vasoconstriction and smooth muscle relaxation or contraction) when bound by epinephrine or norepinephrine as part of the sympathetic nervous system. <They studied how norepinephrine stimulates beta-receptors, a class of adrenoceptors that mediates the release of cyclic adenosine monophosphate inside the nerve cell.—Elliot S. Gershon and Ronald O. Rieder, Scientific American, September 1992> <Thus, in theory, adrenoreceptor agonists which are widely used in the management of obstructive airway diseases such as asthma may lead to mucus plugging of the airways.—Richard W. Costello, in Respiratory Infections in Allergy and Asthma, 2003>

Variants of adrenoceptor



\ə-ˌdrē-nō-ri-ˈsep-tər, -ˌdren-ō-\ play

Seen and Heard

What made you want to look up adrenoceptor? Please tell us where you read or heard it (including the quote, if possible).


a sculptured or ornamented band

Get Word of the Day daily email!