biauricular,a.|baɪɔːˈrɪkjʊlə(r)| [f. bi- prefix2 1 + auricular.] Having two auricles. biauriculatea. the same. 1835Kirby Hab. & Inst.Anim. II. xxii. 414 Heart..bi⁓auriculate.1839Todd Cycl.Anat. III. 991 A bi-auricular structure of the heart, as in the Siren.