Crossword Genius

On an even __ (4)

Ross

I believe the answer is:

keel

(Other definitions for keel that I've seen before include "Earth (Latin)" , "Ship (poet.); its bottom" , "Long part on a boat's bottom" , "Ship's basic longitudinal structure" , "Cool, or it used to be" .)

I've seen this clue in the Universal, the USA Today and the Jonesin'.
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