Definition of "cutis"

I was once, I remember, called to a patient who had received a violent contusion in his tibia, by which the exterior cutis was lacerated, so that there was a profuse sanguinary discharge […]

1749, Henry Fielding, The History of Tom Jones, a Foundling, volumes (please specify |volume=I to VI), London: A[ndrew] Millar, […]

The cutis measures in thickness from a quarter of a line to a line and a half (a line is one-twelfth of an inch).

1883, Alfred Swaine Taylor, Thomas Stevenson, The principles and practice of medical jurisprudence