receptor

noun

re·​cep·​tor ri-ˈsep-tər 

: receiver: such as

a

: a cell or group of cells that receives stimuli : sense organ

b

: a chemical group or molecule (such as a protein) on the cell surface or in the cell interior that has an affinity for a specific chemical group, molecule, or virus

Examples of receptor in a Sentence

Recent Examples on the Web

There are complicated brain-chemistry factors involved that have to do with testosterone, and dopaminergic systems, and kappa-opioid receptors, all of which seem to add up to a Jim Gaffigan joke about how men are morons compared with their wives. —Mckay Coppins, The Atlantic, 12 Mar. 2026

Caffeine wakes you up by inhibiting the ability of the natural sleep chemical adenosine from binding to its receptors. —Laura Dorwart, Verywell Health, 11 Mar. 2026

Fewer than 50 cases of the condition — cerebral folate deficiency in the folate receptor 1 gene — have been identified worldwide. —Michal Ruprecht, CNN Money, 11 Mar. 2026

Unlike most opioids, buprenorphine only partially activates opioid receptors, providing enough stimulation to prevent withdrawal and cravings while not causing euphoria. —Rachel French, The Conversation, 10 Mar. 2026

Word History

First Known Use

1898, in the meaning defined above

Phrases Containing receptor

• alpha-receptor
• beta-receptor
• selective estrogen receptor modulator
• stretch receptor
• T cell receptor

Rhymes for receptor

• acceptor
• preceptor
• adrenoceptor
• photoreceptor
• baroreceptor
• chemoreceptor
• interceptor
• scepter
• sceptre

Kids Definition

receptor

noun

re·​cep·​tor ri-ˈsep-tər 

1

: a cell or group of cells that receives stimuli : sense organ

2

: a molecule (as protein) on the surface or in the inside of a cell that recognizes and joins to specific molecules causing a certain activity within the cell to begin

Medical Definition

receptor

noun

re·​cep·​tor ri-ˈsep-tər 

1

: a cell or group of cells that receives stimuli : sense organ

2

: a chemical group or molecule (as a protein) on the cell surface or in the cell interior that has an affinity for a specific chemical group, molecule, or virus

3

: a cellular entity (as a beta-receptor or alpha-receptor) that is a postulated intermediary between a chemical agent (as a neurohormone) acting on nervous tissue and the physiological or pharmacological response