What is "ridge"

Ridge \Ridge\, v. t. [imp. & p. p. Ridged; p. pr. & vb. n. Ridging.]

1. To form a ridge of; to furnish with a ridge or ridges; to make into a ridge or ridges.

   Bristles ranged like those that ridge the back Of chafed wild boars.
   --Milton.

2. To form into ridges with the plow, as land.

3. To wrinkle. ``With a forehead ridged.''
   --Cowper.

Ridge \Ridge\ (r[i^]j), n. [OE. rigge the back, AS. hrycg; akin to D. rug, G. r["U]cken, OHG. rucki, hrukki, Icel. hryggr, Sw. rugg, Dan. ryg. [root]16.]

1. The back, or top of the back; a crest.
   --Hudibras.

2. A range of hills or mountains, or the upper part of such a range; any extended elevation between valleys. ``The frozen ridges of the Alps.''
   --Shak.

   Part rise crystal wall, or ridge direct.
   --Milton.

3. A raised line or strip, as of ground thrown up by a plow or left between furrows or ditches, or as on the surface of metal, cloth, or bone, etc.

4. (Arch.) The intersection of two surface forming a salient angle, especially the angle at the top between the opposite slopes or sides of a roof or a vault.

5. (Fort.) The highest portion of the glacis proceeding from the salient angle of the covered way.
   --Stocqueler.

Old English hrycg "back of a man or beast," probably reinforced by Old Norse hryggr "back, ridge," from Proto-Germanic *khrugjaz (cognates: Old Frisian hregg, Old Saxon hruggi, Dutch rug, Old High German hrukki, German Rücken "the back"), of uncertain origin. Also in Old English, "the top or crest of anything," especially when long and narrow. The connecting notion is of the "ridge" of the backbone. Spelling with -dg- is from late 15c. Ridge-runner "Southern Appalachian person" first recorded 1917.

n. 1 (lb en anatomy) The back of any animal; especially the upper or projecting part of the back of a quadruped. 2 Any extended protuberance; a projecting line or strip. 3 The line along which two sloping surfaces meet which diverge towards the ground. 4 The highest point on a roof, represented by a horizontal line where two roof areas intersect, running the length of the are

1. v

2. 1 (context transitive English) To form into a ridge 2 (context intransitive English) To extend in ridges

1. v. extend in ridges; "The land ridges towards the South"

2. plough alternate strips by throwing the furrow onto an unploughed strip

3. throw soil toward (a crop row) from both sides; "He ridged his corn"

4. spade into alternate ridges and troughs; "ridge the soil"

5. form into a ridge

1. n. a long narrow natural elevation or striation

2. any long raised strip

3. a long narrow range of hills

4. any long raised border or margin of a bone or tooth or membrane

5. a beam laid along the ridge of a roof; provides attachment for upper end of rafters [syn: ridgepole, rooftree]

A ridge is an elongated region of relatively high atmospheric pressure, the opposite of a trough.

In hydrologic terms, a ridge is a line or wall of broken ice forced up by pressure. May be fresh or weathered.

A ridge is a geological feature that features a continuous elevational crest for some distance.

Ridge may also refer to:

In differential geometry, a smooth surface in three dimensions has a ridge point when a line of curvature has a local maximum or minimum of principal curvature. The set of ridge points form curves on the surface called ridges.

The ridges of a given surface fall into two families, typically designated red and blue, depending on which of the two principal curvatures has an extremum.

At umbilical points the colour of a ridge will change from red to blue. There are two main cases: one has three ridge lines passing through the umbilic, and the other has one line passing through it.

Ridge lines correspond to cuspidal edges on the focal surface.

Ridges (regions of increased gene expression) are domains of the genome with a high gene expression; the opposite of ridges are antiridges. The term was first used by Caron et al. in 2001. Characteristics of ridges are:

• Gene dense
• Contain many C and G nucleobases
• Genes have short introns
• high SINE repeat density
• low LINE repeat density

Ridge was a station on the Chicago Transit Authority's Niles Center branch, now known as the Yellow Line. The station was located at Ridge Avenue and Brummel Street in Evanston, Illinois. Ridge was situated east of Asbury and west of Howard. Ridge opened on March 28, 1925, and closed on March 27, 1948 upon the closing of the Niles Center branch.

A ridge or mountain ridge is a geological feature consisting of a chain of mountains or hills that form a continuous elevated crest for some distance. Ridges are usually termed hills or mountains as well, depending on size. There are several main types of ridges:-

• Dendritic ridge:- In typical dissected plateau terrain, the stream drainage valleys will leave intervening ridges. These are by far the most common ridges. These ridges usually represent slightly more erosion resistant rock, but not always – they often remain because there were more joints where the valleys formed, or other chance occurrences. This type of ridge is generally somewhat random in orientation, often changing direction frequently, often with knobs at intervals on the ridge top.
• Stratigraphic ridge:- In places such as the Ridge-and-Valley Appalachians, long, even, straight ridges are formed because they are the uneroded remaining edges of the more resistant dipping strata that were folded laterally. Similar ridges have formed in places such as the Black Hills, where the ridges form concentric circles around the igneous core. Sometimes these ridges are called " hogback ridges".
• Oceanic spreading ridge:- In tectonic spreading zones around the world, such as at the Mid-Atlantic Ridge, the volcanic activity forming new plate boundary forms volcanic ridges at the spreading zone. Isostatic settling and erosion gradually reduce the elevations moving away from the zone.
• Crater ridges:- Large meteorite strikes typically form large impact craters bordered by circular ridges.
• Volcanic crater/caldera ridges:- Large volcanoes often leave behind a central crater/ caldera bordered by circular ridges.
• Fault ridges:- Faults often form escarpments. Sometimes the tops of the escarpments form not plateaus, but slope back so that the edges of the escarpments form ridges.
• Dune ridges:- In areas of large-scale dune activity, certain types of dunes result in sand ridges.
• Moraines and eskers:- Glacial activity may leave ridges in the form of moraines and eskers. An arête is a thin ridge of rock that is formed by glacial erosion.
• Volcanic subglacial ridges:- Many subglacial volcanoes create ridge-like formations when lava erupts through a thick glacier or ice sheet.
• Shutter ridges:- A shutter ridge is a ridge which has moved along a fault line, blocking or diverting drainage. Typically, a shutter ridge creates a valley corresponding to the alignment of the fault that produces it.