Flat (?), a. [Compar. Flatter (?); superl. Flattest (?).] [Akin to
Icel. flatr, Sw. flat, Dan. flad, OHG. flaz, and AS. flet floor, G.
flˆtz stratum, layer.] 1. Having an even and horizontal surface, or
nearly so, without prominences or depressions; level without
inclination; plane.
Though sun and moon Were in the flat sea sunk.
Milton.
2. Lying at full length, or spread out, upon the ground; level with the
ground or earth; prostrate; as, to lie flat on the ground; hence,
fallen; laid low; ruined; destroyed.
What ruins kingdoms, and lays cities flat!
Milton.