Isaacus

== Latin == === Pronunciation === (Classical Latin) IPA(key): [ɪ.saˈaː.kʊs], [ɪˈsa.a.kʊs] (modern Italianate Ecclesiastical) IPA(key): [i.s̬aˈaː.kus], [iˈs̬aː.a.kus] === Proper noun === Isaā̆cus m sg (genitive Isaā̆cī); second declension alternative form of Isaāc ==== Declension ==== Second-declension noun, singular only.