1778 A. Monro (ed. 2) xix. 106 Inserted into a cordiform tendon, of a considerable breadth, which is situated in the middle of the diaphragm.
1864 C. Heath iii. 220 All the fibres of the diaphragm are inserted into the central cordiform or trefoil tendon.
1903 7 Feb. 394/2 The movements of the cordiform tendon during inspiratory expansion of the chest.