Entry 1 sense Webster, 1913 Octangular /ŏk-tăngʹgyə-lər/ · Oc·tan·gu·lar · IPA /ɑkˈtæŋ.ɡjə.lə(ɹ)/ 01 a. Having eight angles; eight-angled. 1. Having eight angles; eight-angled.