In
Greek mythology,
Thoosa (Θόωσα) was a
Nereid, and one of
Poseidon's
paramour. She became
mother of the
Cyclops Polyphemus when Poseidon possessed her in a sea cave. She was the daughter of
Phorcys and
Ceto. However being a Nereid she could also be the daughter of
Nereus and
Doris.