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The quality or state of being flat.

p; to become twisted out of shape. Stuff is said to cast or warp when . . . it alters its flatness or straightness. Moxon.

Characterized by flatness of head, especially that produced by artificial means, as a certain tribe of American Indians.

A block or plate having a perfectly flat surface, used as a standard of flatness; a surface plate.

Flatness. [Obs.] Palsgrave.

proof spirits respectively. -- Proof staff, a straight-edge used by millers to test the flatness of a stone. -- Proof stick (Sugar Manuf.), a rod in the side of a vacuum pan, for testing the consistency of the sirup. -- Proof text, a passage of Scripture used to prove a doctrine. proof coin or proof, a coin which h…

e plate (Mach.), a plate having an accurately dressed flat surface, used as a standard of flatness by which to test other surfaces. -- Surface printing, printing from a surface in relief, as from type, in distinction from plate printing, in which the ink is contained in engraved lines.