Receptor/rɪˈseptər/ Definition 1 of 3Pro Tip 1/2Selective Binding Receptors bind with specific substances, much like a lock with its key. Medications target brain receptors to alleviate pain. Pro Tip 2/2Cellular Communication Receptors play a key role in how cells communicate and function within the body. Certain aromas trigger nasal receptors, letting us enjoy scents.