Atlanticus
Could not find Atlanticum in Logeion dictionaries.
Atlanticum proper-name adjective neuter vocative singular, proper-name adjective masculine genitive plural, proper-name adjective masculine accusative singular, proper-name adjective neuter genitive plural, proper-name adjective neuter nominative singular, proper-name adjective neuter accusative singular of Atlanticus
Atlantĭcus, (16) v. Atlantiacus.