neurochemical

adj

1. (not-comparable)Of or pertaining to neurochemistry, the study of the chemical basis of nerve and brain activity

   “A neurochemical study of the new drug was conducted.”

noun

1. A chemical substance that is involved in neural activity, such as a neurotransmitter

   “For many years, this type of specificity gave rise to the hope that science would be able to link specific neurochemicals to specific behaviors, […]”