Crossword Genius

Small bone of the wrist near the base of the thumb (9)

Ross

I believe the answer is:

trapezium

(Other definitions for trapezium that I've seen before include "Type of quadrilateral" , "Form of quadrilateral" , "Certainly no square" , "Carpal bone" , "Quadrilateral with a parallel pair of sides" .)

I've seen this clue in The Independent.
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