a long, narrow elevation of land; a chain of hills or mountains.

the long and narrow upper edge, angle, or crest of something, as a hill, wave, or vault.

the back of an animal.

any raised, narrow strip, as on cloth.

the horizontal line in which the tops of the rafters of a roof meet.

(on a weather chart) a narrow, elongated area of high pressure.

to provide with or form into a ridge or ridges.

to mark with or as if with ridges.

to form ridges.

noun

flat , plain

noun

backbone , chine , corrugation , crease , crinkle , elevation , esker , fold , furrow , hill , hogback , moraine , parapet , plica , pole , range , rib , rim , rimple , rivel , ruck , seam , spine , upland , wrinkle , anticline , arete , back , balk , bank , bluff , costa , crest , dune , fluting , groove , hummock , hump , knoll , ledge , levee , milling , ness , promontory , reef , ruga , rugae , rugosity , serration , spur , stria , summit , wale , wave , weal , wedge , welt , whelk