Could not find Ποσιδηίου in Logeion dictionaries.
Ποσιδηίου
Proper-name noun: neuter genitive singular of
Ποσιδήϊον
Ποσιδηίου
Proper-name adjective: masculine genitive singular, Proper-name adjective: neuter genitive singular, Proper-name noun: neuter genitive singular of
Ποσιδήϊος
See Ποσιδηίου in Morpho