Crossword Genius

Ancient Greek or Roman war galley (7)

Ross

I believe the answer is:

trireme

(Other definitions for trireme that I've seen before include "Long rowing boat" , "Ancient galley with three tiers of oars on each side" , "Ancient warship with three banks of oars" , "Roman/Greek galley" , "Greek warship" .)

I've seen this clue in The Sun and The Times.
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