Entry 2 senses · 2 variants Webster, 1913 Paranoiac /(păr`ȧ*noi"ăk)/ · Par·a·noi·ac · IPA /ˌpæɹəˈnɔɪæk/ a. n. 01 a. Of or pertaining to paranoia; affected with, or characteristic of, paranoia; paranoid. 1. Of or pertaining to paranoia; affected with, or characteristic of, paranoia; paranoid.(Med.) 02 n. A person affected with paranoia. 1. A person affected with paranoia.