Entry 1 sense Webster, 1913 Labyrinthine /lăbˌ-ẽr-ĭn'-thēnˌ/ · Lab·y·rin·thine · IPA /ˌlæb.əˈɹɪn.θɪn/ 01 a. Pertaining to, or like, a labyrinth; labyrinthal; labyrinthian. 1. Pertaining to, or like, a labyrinth; labyrinthal; labyrinthian.