antheridial,a.|ænθəˈrɪdɪəl| [f. next + -al1.] Pertaining to, or of the nature of, an antheridium. 1848Dana Zooph. v. 92 The union of a final cellule, with some other which is antheridial in its nature.1875tr.Sachs' Bot. 803 The antheridial branches of some Saprolegnieæ.