Entry 2 senses · 2 variants Webster, 1913 Gonidial · Go·nid·i·al · IPA a. a. 01 a. Pertaining to, or containing, gonidia. 1. Pertaining to, or containing, gonidia.(Bot.) 02 a. Of or pertaining to the angles of the mouth; as, a gonidial groove of an actinian. 1. Of or pertaining to the angles of the mouth; as, a gonidial groove of an actinian.(Zool.)