neu·ro·pharmacology \"ˌ\noun Etymology:neur- + pharmacology 1.: a branch of medical science dealing with the action of drugs on and in the nervous system 2.: the properties and reactions of a drug on and in the nervous system < the neuropharmacology of lithium > • neu·ro·pharmacological\"ˌ\alsoneu·ro·pharmacologic\"ˌ\adjective • neu·ro·pharmacologist\"ˌ\noun