Assorted References. 1  cloning (in cloning) 2  cytoskeleton (in cytoskeleton) 3  fluid regulation (in excretion: Regulation of water and salt balance) 4  genetic behaviour (in genetics) 5  immune system (in immune system: Cellular defenses) 6  interaction with drugs (in drug: Mechanisms) 7  mutation (in mutation (genetics)) 8  cytology (in cytology)
Definition of neurotransmitter in English: A chemical substance which is released at the end of a nerve fibre by the arrival of a nerve impulse and, by diffusing across the synapse or junction, effects the transfer of the impulse to another nerve fibre, a muscle fibre, or some other structure.Example sentences.oun. A chemical substance which is released at the end of a nerve fibre by the arrival of a nerve impulse and, by diffusing across the synapse or junction, effects the transfer of the impulse to another nerve fibre, a muscle fibre, or some other structure.
neurotransmitter. a substance (e.g., norepinephrine, acetylcholine, dopamine) that is released from the axon terminal of a presynaptic neuron on excitation, and that travels across the synaptic cleft to either excite or inhibit the target cell.