Am·brose (ām'brōz') Writer, composer, and bishop of Milan (374-397) who imposed orthodoxy on the early Christian Church. Am·bro'sian (ām-brō'zhən) adj.
masc. proper name, from L. Ambrosius, from Gk. ambrosios "immortal, belonging to the immortals" (see ambrosia). The Ambrosian Library in Milan is named for St. Ambrose, bishop of Milan.