Crossword Genius

Surface boundary (4)

Ross

I believe the answer is:

edge

'surface boundary' is the definition.
(I've seen this in another clue)

This is all the clue.

(Other definitions for edge that I've seen before include "Skirt" , "Upper hand" , "Sidle, lip" , "Move slowly" , "Sharpened side of blade" .)

I've seen this clue in the Newsday.
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