Of or relating to area; consisting of or measured in two dimensions; esp. relating to surface extent or area. Cf. square, adj. 1c.

Of, pertaining to, or of the nature of, an area.

With reference to the surface of the earth or ground (sense 1b), as surface bed, surface earth, surface manuring, surface mould, surface peat, surfac…

= superficial, adj. 1c. Now rare except in superfoot, n.