Thybris
Could not find Thybri in Logeion dictionaries.
Thybri Proper-name noun: masculine vocative singular, Proper-name noun: masculine ablative singular of Thybris
Thybris, is, v. Tiberis init.
Thybris, die Tiber, s. Tiberis.
Thȳbris, (11) v. Tiberis.