baptismum Save Could not find baptismo in Logeion dictionaries. baptismo Noun: neuter dative singular, Noun: neuter ablative singular of baptismum baptismo Noun: masculine ablative singular, Noun: masculine dative singular of baptismus See baptismo in Morpho Gaffiot 2016 baptismum, n. ( -mus, m. ), ī (βαπτισμός), baptême : Tert. Bapt. 15 ; Eccl.