Cas ‧ tor and Pol ‧ lux /ˌkɑːstər ənd ˈpɒləks $ ˌkæstər ənd ˈpɑː-/ BrE AmE
in ancient Greek and Roman stories, two brothers who were ↑ twin s (=two children born at the same time) , and who had many adventures. The group of stars known as ↑ Gemini or the Heavenly Twins is named after them.