Crossword Genius

Ancient battleship with three banks of oars on each side (7)

Ross

I believe the answer is:

trireme

(Other definitions for trireme that I've seen before include "Galley with three banks of oars" , "Oar-driven battleship of classical times" , "Ancient warship with three banks of oars" , "Ancient vessel with three banks of oars on each side" , "Roman/Greek galley" .)

I've seen this clue in The Guardian.
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