Receptors

Part of speech: noun

Definitions

1. Specialized components in living organisms that identify and react to various external stimuli
2. Biological entities that receive and interpret signals from the environment, influencing responses
3. Cellular structures that perceive and transmit information from external sources to the organism

Etymology: "Receptors" is the plural of "receptor," a noun for the structures in cells and tissues that detect stimuli. The word's ancestry runs through a single idea: taking something in. Its Latin root, "recipere," combined "re-," meaning "back," with "capere," meaning "to hold" or "to take," so the original sense was to take back or receive. English picked it up through Middle English "receptour," which came from Old French, and the Latin form "receptorius" sits alongside it in the family tree. The modern biological sense is a long way from a container or a person who gets things. A receptor is valued because it accepts a specific signal, such as a hormone molecule or a light particle, and passes the message on. The word's Latin core still shows in that job: the cell is holding out to receive something from outside.