Entry 1 sense Webster, 1913 Neurology /no͝or-äl'-əj-ē/ · Neu·rol·o·gy · IPA /n(j)ʊ(ə)ˈɹɒləd͡ʒi/ 01 n. The branch of science which treats of the nervous system. 1. The branch of science which treats of the nervous system.