a. Anat. [f. supinato- (used as combining form of L. supīnātus supinated, in sense of SUPINATOR) + EXTENSOR.] Applied to the mass of supinator and extensor muscles of the fore or hind limb, or their action.
1872. Humphry, Myology, 28. The muscles on the dorsal aspect of the leg and foot form a supinato-extensor mass. Ibid., 169. The fibres on the dorsal aspect, having a supinato-extensor action, take a similar direction.
