Dog-tooth


Dog-tooth
Dog-tooth ornament

A dog-tooth or "dogtooth pattern", in architecture, is an ornament found in the moldings of medieval work of the commencement of the 12th century, which is thought to have been introduced by the Crusaders from the East. The earliest example is found in the hall at Rabbath Ammon in Moab (c. 614) built by the Sassanians, where it decorates the arch molding of the blind arcades and the string courses. The pattern consists of four flower petals forming a square or diamond shape with a central element. The petals have the form of the pointed conical canine tooth, eye tooth or cuspid.

In the apse of the church at Murano, near Venice, it is similarly employed. In the 12th and 13th centuries it was further elaborated with carving, losing therefore its primitive form, but constituting a most beautiful decorative feature. In Elgin Cathedral the dogtooth ornament in the archivolt becomes a four-lobed leaf, and in Stone church, Kent, a much more enriched type of flower. The term has been supposed to originate in a resemblance to the dog tooth violet, but the original idea of a projecting tooth is a sufficient explanation.

"Dogtooth" is also a woven fabric pattern which resembles a canine tooth.

Aviation

Clearly visible near the wing tip is the jagged "dog-tooth" leading edge

A "dogtooth" in aviation is a wing or tailplane design where the leading edge of the airfoil has a noticeable "notch." Many high-performance aircraft use the dogtooth design, which induces a vortex over the wing to reduce boundary layer separation, increasing lift and improving resistance to stall. Some of the most well-known uses of the dogtooth is in the stabilizer of the F-15 Eagle, the wings of the F-4 Phantom II, F/A-18 Super Hornet, or the CF-105 Arrow. It was first implemented in the Flyer IV of the Wright brothers.

See also

 This article incorporates text from a publication now in the public domainChisholm, Hugh, ed (1911). Encyclopædia Britannica (11th ed.). Cambridge University Press. 


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  • dog|tooth — «DG TOOTH, DOG », noun, plural teeth. 1. = canine tooth. (Cf. ↑canine tooth) 2. Architecture. a toothlike ornament, usually a pyramidal projection made up of radiating parts, or a series of these, as on a medieval molding …   Useful english dictionary

  • dog-tooth — ► NOUN 1) Architecture a small pointed moulding forming one of a series radiating from a raised centre. 2) (also dogstooth) a small check pattern with notched corners …   English terms dictionary

  • dog-tooth — noun 1》 Architecture a small pointed moulding forming one of a series radiating like petals from a raised centre. 2》 (also dogstooth) a small check pattern with notched corners suggestive of a canine tooth …   English new terms dictionary

  • dog tooth — noun see dogtooth I, 1 …   Useful english dictionary

  • dog-tooth — …   Useful english dictionary

  • dog-tooth grenadier — šuninis grenadierius statusas T sritis zoologija | vardynas taksono rangas rūšis atitikmenys: lot. Cynomacrurus piriei angl. dog tooth grenadier rus. собачьи макрурус; циномакрурус ryšiai: platesnis terminas – šuniniai grenadieriai …   Žuvų pavadinimų žodynas

  • dog-tooth crystal; dog-tooth spar —    A variety of calcite in the form of sharppointed crystals [10] …   Lexicon of Cave and Karst Terminology

  • Dog-Tooth Ornament — ♦ A late 12th and early 13th century development from the nail head, in which the pyramids are cut into four petalled flowers; used on hollow mouldings. (Wood, Margaret. The English Medieval House, 411) …   Medieval glossary

  • Tooth — (t[=oo]th), n.; pl. {Teeth} (t[=e]th). [OE. toth,tooth, AS. t[=o][eth]; akin to OFries. t[=o]th, OS. & D. tand, OHG. zang, zan, G. zahn, Icel. t[ o]nn, Sw. & Dan. tand, Goth. tumpus, Lith. dantis, W. dant, L. dens, dentis, Gr. odoy s, odo ntos,… …   The Collaborative International Dictionary of English

  • Tooth and nail — Tooth Tooth (t[=oo]th), n.; pl. {Teeth} (t[=e]th). [OE. toth,tooth, AS. t[=o][eth]; akin to OFries. t[=o]th, OS. & D. tand, OHG. zang, zan, G. zahn, Icel. t[ o]nn, Sw. & Dan. tand, Goth. tumpus, Lith. dantis, W. dant, L. dens, dentis, Gr. odoy s …   The Collaborative International Dictionary of English