Greek god that sounds like 66-Across Crossword Clue

 The Greek god that sounds like 66-Across in a crossword clue is Poseidon.

Poseidon is the god of the sea, earthquakes, and horses in Greek mythology. He is the son of the Titans Cronus and Rhea, and the brother of Zeus and Hades.

The name "Poseidon" comes from the Greek word "posis", which means "sea". He is often depicted as a bearded man with a trident, which is a three-pronged spear.

The 66-Across clue in a crossword puzzle could be "Sounds like Poseidon", which would be a reference to the similarity between the two words.

I hope this helps!