What is the X in X-mas?
1510s, "gallery, portico, balcony," later "flat, raised place for walking" (1570s), from Middle French terrace, from Old French terrasse "platform (built on or supported by a mound of earth)," from Vulgar Latin *terracea, fem. of *terraceus "earthen, earthy," from Latin terra "earth, land" (see terrain). As a natural formation in geology, attested from 1670s.
terrace ter·race (těr'ĭs)
v. ter·raced, ter·rac·ing, ter·rac·es
To suture in several rows, as when closing a wound through a considerable thickness of tissue.