What does Boxing Day have to do with boxing?
1713, from Medieval Latin tapetum, from Latin tapete "carpet."
tapetum ta·pe·tum (tə-pē'təm)
n. pl. ta·pe·ta (-tə)
A membranous layer or region, especially the iridescent membrane of the choroid of certain mammals.
A layer of fibers of the corpus callosum forming the roof of part of the lateral ventricle of the brain.