Crossword Genius

Thoracic division (9)

Ross

I believe the answer is:

diaphragm

(Other definitions for diaphragm that I've seen before include "Midriff" , "Flexible membrane" , "Thin dividing membrane" , "Partitioning membrane" , "It separates the thorax from the abdomen" .)

I've seen this clue in The Telegraph.
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