flatness
131Flathead — Flat head , a. Characterized by flatness of head, especially that produced by artificial means, as a certain tribe of American Indians. [1913 Webster] …
132Heating surface — Surface Sur face , n. [F. See {Sur }, and {Face}, and cf. {Superficial}.] 1. The exterior part of anything that has length and breadth; one of the limits that bound a solid, esp. the upper face; superficies; the outside; as, the surface of the… …