SUPERFI'CIES, noun [Latin from super, upon, and facies, face.] The surface; the exterior part of a thing. A superficies consists of length and breadth; as the superficies of a plate or of a sphere. superficies is rectilinear, curvilinear, plane, convex or concave.
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Webster's Dictionary 1828
American Dictionary of the English Language, Noah Webster, 1828.