Crossword Genius

Nautical spine (4)

Ross

I believe the answer is:

keel

'nautical spine' is the definition.
(I've seen this in another clue)

This is the entire clue.

(Other definitions for keel that I've seen before include "Lengthwise structure of a ship" , "Structural member of a ship" , "Bottom of boat" , "Cool, or it used to be" , "Low part of ship" .)

I've seen this clue in The Washington Post, the LA Times, the L.A. Times Daily, the Newsday.com and the Universal.
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