cutis

cutis puhekieltä The true skin or dermis, underlying the epidermis.
(RQ:Fielding Tom Jone)

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 (..)

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).