different between projection vs ridge

English

Etymology

From either the Middle French projection or its etymon, the Classical Latin pr?iecti? (stem: pr?iecti?n-), from pr?ici?. Compare the Modern French projection, the German Projektion, and the Italian proiezione.

Pronunciation

• IPA^(key): /p???d??k??n/
• Rhymes: -?k??n

Noun

projection (countable and uncountable, plural projections)

1. Something which projects, protrudes, juts out, sticks out, or stands out.

   The face of the cliff had many projections that were big enough for birds to nest on.

2. The action of projecting or throwing or propelling something.
   1. (archaic) The throwing of materials into a crucible, hence the transmutation of metals.
3. (archaic) The crisis or decisive point of any process, especially a culinary process.
4. The display of an image by devices such as movie projector, video projector, overhead projector or slide projector.
5. A forecast or prognosis obtained by extrapolation
6. (psychology) A belief or assumption that others have similar thoughts and experiences as oneself
7. (photography) The image that a translucent object casts onto another object.
8. (cartography) Any of several systems of intersecting lines that allow the curved surface of the earth to be represented on a flat surface. The set of mathematics used to calculate coordinate positions.
9. (geometry) An image of an object on a surface of fewer dimensions.
10. (linear algebra) An idempotent linear transformation which maps vectors from a vector space onto a subspace.
11. (mathematics) A transformation which extracts a fragment of a mathematical object.
12. (category theory) A morphism from a categorical product to one of its (two) components.

Synonyms

• (something which sticks out): protuberance

Derived terms

Related terms

• project

Translations

Further reading

• projection on Wikipedia.Wikipedia

French

Pronunciation

Noun

projection f (plural projections)

1. projection
2. screening (of a film)

Interlingua

Noun

projection (plural projectiones)

1. projection

English

Alternative forms

• rig (dialectal)

Etymology

From Middle English rigge, rygge, (also rig, ryg, rug), from Old English hry?? (“back, spine, ridge, elevated surface”), from Proto-Germanic *hrugjaz (“back”), from Proto-Indo-European *(s)kreuk-, *(s)ker- (“to turn, bend”). Cognate with Scots rig (“back, spine, ridge”), North Frisian reg (“back”), West Frisian rêch (“back”), Dutch rug (“back, ridge”), German Rücken (“back, ridge”), Swedish rygg (“back, spine, ridge”), Icelandic hryggur (“spine”). Cognate to Albanian kërrus (“to bend one's back”) and kurriz (“back”).

Pronunciation

• (UK, US) enPR: r?j, IPA^(key): /??d?/
• Rhymes: -?d?

Noun

ridge (plural ridges)

1. (anatomy) The back of any animal; especially the upper or projecting part of the back of a quadruped.
   • 1663–1678, Samuel Butler, Hudibras, part III, canto I, pages 91–92:

     He though it was no time to ?tay, / And let the Night too ?teal away, / But in a trice advanced the Knight, / Upon the Bare Ridge, Bolt upright, / And groping out for Ralpho’s Jade, / He found the Saddle too was ?traid […]

2. Any extended protuberance; a projecting line or strip.

   Antonym: groove

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 area.
5. (fortifications) The highest portion of the glacis proceeding from the salient angle of the covered way.
   • 1853-1855, Joachim Hayward Stocqueler , The Life of Field-Marshal the Duke of Wellington

     the British Guards lie down behind a ridge to avoid the shot and shell from the opposite heights

6. A chain of mountains.
   • c. 1595, William Shakespeare, Richard II, [Act I, scene i], lines 62–66:

     […] Which to maintaine, I would allow him oddes, / And meete him, were I tide to runne afoote, / Euen to the frozen ridges of the Alpes, / Or any other ground inhabitable, / Where euer Engli?hman dur?t ?et his foote.

7. A chain of hills.
8. (oceanography) A long narrow elevation on an ocean bottom.
9. (meteorology) An elongated region of high atmospheric pressure.
   • Antonym: trough

Derived terms

Translations

Verb

ridge (third-person singular simple present ridges, present participle ridging, simple past and past participle ridged)

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

Related terms

• Rhodesian Ridgeback

See also

• crest

Anagrams

• derig, dirge, gride, redig