Crossword Genius

Triangular pelvic bones (5)

Ross

I believe the answer is:

sacra

'triangular pelvic bones' is the definition.
(I've seen this in another clue)

This is all the clue.

(Other definitions for sacra that I've seen before include "Bones that form the human pelvic arch" , "Triangular bones" .)

I've seen this clue in The Times, the L.A. Times Daily and The Sunday Times.
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