Entry 1 sense Webster, 1913 Basylous · Bas·y·lous · IPA /ˈbæsɪləs/ 01 a. Pertaining to, or having the nature of, a basyle; electro-positive; basic; -- opposed to chlorous. 1. Pertaining to, or having the nature of, a basyle; electro-positive; basic; -- opposed to chlorous.