GONIAL Meaning of GONIAL in English ˈgōnēəl adjectivealso go·ni·ac -ēˌakEtymology: goni- + -al or -ac (as in maniac )1. : of or relating to the gonion2. : of or relating to gones or gonia Webster's New International English Dictionary. Новый международный словарь английского языка Webster. 2012