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receptor (re-sepītәr)   a molecule on or within a cell that recognizes and binds with specific molecules, producing some effect in the cell. One on the cell surface is called a cell-surface or membrane receptor, and one inside a cell (usually in its nucleus) is called a nuclear receptor. Examples are the cell-surface receptors of immunocompetent cells that recognize antigens, complement components, or lymphokines, and cell-surface receptors of neurons and target organs that can recognize neurotransmitters or hormones.
  a sensory nerve ending that responds to stimuli; called also sensory receptor.




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