Quadrilateral (9)

I think it could be either:

rectangle

foursided

'quadrilateral' is the definition.
(I know that rectangle is a type of parallelogram)

This is the entire clue.

(Other definitions for rectangle that I've seen before include "Geometric figure with four right angles, not square" , "Four sides involved in this" , "Quadrilateral" , "box" , "Four-sided figure" .)

I've seen this clue in The Telegraph.

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