receptor

noun3

1. •
   A protein on a cell wall that binds with specific molecules so that they can be absorbed into the cell in order to control certain functions.

   • In the target organ, the drug is recognised by ‘receptors’. These are large molecules, usually proteins, to which the drug binds tightly and with a high degree of specificity. — 2001
2. •
   Any specialized cell or structure that responds to sensory stimuli.
3. •
   (no longer used) One who receives something or someone; in particular, one who harbors a fugitive.

   • The kind Receptors of the Fugitiues after the Detection. — 1609