Superficiary \Su`per*fi"ci*a*ry\, n. (Rom. Law) One to whom a right of surface occupation is granted; one who pays quitrent for a house built upon another man's ground. Superficiary \Su`per*fi"ci*a*ry\, a. 1. Of or pertaining to the superficies, or surface; superficial. 2. (Rom. Law) Situated or built on another man's land, as a house.