Crossword Genius

Warship with two banks of oars (6)

Ross

I believe the answer is:

bireme

(Other definitions for bireme that I've seen before include "with two tiers" , "Ancient galley with two banks of oars on each side" , "Ancient oared warship" , "Old ship" , "rowing boat" .)

I've seen this clue in The Wall Street Journal and the King Feature Syndicate.
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