neurotransmitter

noun

• Chemical released by nerves that boost signals within the body
• A chemical substance that transmits nerve impulses across a synapse.
• A chemical substance that is released at the end of a nerve fiber by the arrival of a nerve impulse and, by diffusing across the synapse or junction, effects the transfer of the impulse to another nerve fiber, a muscle fiber, or some other structure.
• A chemical involved in the transmission of signals between nerve cells, and whose dysfunction can lead to disease.