(aeronautics) A moveable surface attached to a machine such as an aircraft or submarine that can be used to control the machine's motion in roll, pitch or yaw.

(geography) Water collecting on the ground or in a stream, river, lake, sea or ocean, as opposed to groundwater.

(engineering) The quality of a surface, in terms of its roughness, microscopic pattern (lay) and macroscopic pattern (waviness).

Mail which is transported by motor vehicle, by railway, or by seacraft, but not by aircraft.

plural of surface finish

A street that is not a freeway and has at-grade intersections with other surface streets.

plural of surface normal

(geometry) A ruled surface whose rulings are all parallel to a fixed plane.

plural of Catalan surface

plural of surface etymology