Crossword Genius

Body of water having same dimensions? (3)

Ross

I believe the answer is:

med

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'body of water' is the definition.
(short for Mediterranean)

I don't understand the rest of the clue.

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(Other definitions for med that I've seen before include "Sea (informal)" , "Mediterranean (colloq.)" , "Cote d'Azur sea" , "Sea (abbr)" .)

I've seen this clue in The Mirror.
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