plural noun Classical Mythology.
- twin sons of Leda and brothers of Helen, famous for their fraternal affection and regarded as the protectors of persons at sea.
noun
- classical myth the twin sons of Leda: Pollux was fathered by Zeus, Castor by the mortal Tyndareus. After Castor’s death, Pollux spent half his days with his half-brother in Hades and half with the gods in Olympus