Latin Pronunciation (Classical Latin) IPA(key): /ˈsu.bi.um/, [ˈs̠ʊbiʊ̃ˑ] (modern Italianate Ecclesiastical) IPA(key): /ˈsu.bi.um/, [ˈsuːbium] Noun subium n (genitive subiī); second declension moustache c. 350, Charisius, Ars Grammatica, volume v:subium μύσταξ[subium moustache] Declension Second-declension noun (neuter).More information singular, plural ... singular plural nominative subium subia genitive subiī subiōrum dative subiō subiīs accusative subium subia ablative subiō subiīs vocative subium subia Close Wikiwand - on Seamless Wikipedia browsing. On steroids.