Saw-like appearance; a row of sharp projections on an edge
For the radar equipment, see Serrate radar detector.
The serrated edges of tiger shark teethA hunting knife with a serrated back edgeSerrated leaves of the stinging nettle, Urtica dioica
Serration is a saw-like appearance or a row of sharp or tooth-like projections. A serrated cutting edge has many small points of contact with the material being cut. By having less contact area than a smooth blade or other edge, the applied pressure at each point of contact is greater, and the points of contact are at a sharper angle to the material being cut. This causes a cutting action that involves many small splits in the surface of the material being cut, which cumulatively serve to cut the material along the line of the blade.[1]
In nature, serration is commonly seen in the cutting edge on the teeth of some species, usually sharks. However, it also appears on non-cutting surfaces, for example, in botany where a toothed leaf margin or other plant part, such as the edge of a carnation petal, is described as being serrated. A serrated leaf edge may reduce the force of wind and other natural elements.[2] Probably[clarification needed] the largest serrations on Earth occur on the skylines of mountains (the Spanish word sierra, as in the Sierra Nevada, means a saw). These occur due to the uneven action of landform edges pushing rock upwards, and the uneven action of erosion.[citation needed]
Human uses of serration have copied, and gone beyond, those found in nature. For example, the teeth on a saw or other serrated blade serve a similar cutting or scraping purpose as the serration of an animal tooth. Tailors use pinking shears to cut cloth with a serrated edge, which, somewhat counterintuitively, reduces fraying by reducing the average length of a thread that may be pulled from the edge.[3] A type of serration is also found in airframe shapes used in certain stealth aircraft, which use the jaggedness of the serrated edge to deflect radar signals from seams and edges where a straight, non-serrated edge would reflect radar signals to the source. Screw threads show serration in profile, although they are usually shown in abbreviated or symbolic fashion on mechanical drawings to save time and ink. Brogue shoes are made with serrated edges on the leather pieces, for no known purpose at all other than style. The step clamp and step block assembly in metalworking adopt serration for the purpose of applying clamping pressure from an adjustable position.
^Alloway, David (2000). Desert Survival Skills. University of Texas Press. p. 38. ISBN 978-0-292-70492-3.
^Hemsley, Alan R.; Poole, Imogen (2005). The Evolution of Plant Physiology. p. 220.
^Audin, Heather (2015). "2". Making Victorian Costumes for Women.
Serration is a saw-like appearance or a row of sharp or tooth-like projections. A serrated cutting edge has many small points of contact with the material...
Tooth serration — Vertical serration along edge of blade Single edge serration — Serration on one side, the other remains flat Double edge serration — Serration...
are characterized by (1) basal dilation of the crypts, (2) basal crypt serration, (3) crypts that run horizontal to the basement membrane (horizontal crypts)...
plumage. The underside of the claw of the middle toe is comb-like with serrations. Their soft plumage is cryptically coloured to resemble bark or leaves...
A tooth (pl.: teeth) is a hard, calcified structure found in the jaws (or mouths) of many vertebrates and used to break down food. Some animals, particularly...
special agents will be issued the Glock 19 Gen 5 MOS with forward slide serrations, Ameriglo Bold night sights, and a Streamlight TLR-7A weapon light. The...
mucosae. Goblet cell-rich type: Elongated, fat crypts and little to no serration. Filled with goblet cells, extending to surface, which commonly has a...
Velociraptor were fairly homodont (equal in shape) and had several denticles (serrations), each more strongly serrated on the back edge than the front. The premaxilla...
distinguished its red-striped stem, and leaves that are thicker with less coarse serration. In addition, Angelica keiskei does not produce its first flowers until...
bring the flapping of the wing down to a nearly silent mechanism. The serrations are more likely reducing aerodynamic disturbances, rather than simply...
or gizzard-stones. The majority of theropod teeth are blade-like, with serration on the edges, called ziphodont. Others are pachydont or folidont depending...
from the midrib of the leaflet to the point of the serration, the vein serving the tip of the serration passes close by the intervening notch. Sometimes...
proportion without breaking), drawing serrations across the loaf with little downward force will allow each serration to simultaneously cut the bread with...
which differs from the type in its smaller leaves with less deeply cut serration on the margins. Zelkova serrata is a medium-sized deciduous tree usually...
edges of the jaws. These sheaths may have sharp edges for cutting meat, serrations for clipping plants, or broad plates for breaking mollusks. Sea turtles...
handles were often no more than two wooden slabs riveted to the tang. Serrations appeared on knives in the 19th century for use as a wood saw or fish scaler...
England appears to have been the first to develop the industrial process of serration-making. Then, by 1897, the Redtenbacher Company of Scharnstein, in Austria—at...
means "brilliant"'. The word 'gigi' means "tooth", while 'gerigi' means "serration"'. In Seri, some verbs form the plural stem with infixation of ⟨tóo⟩ after...
sturdy leather uppers with decorative perforations (or "broguing") and serration along the pieces' visible edges. Brogues were traditionally considered...
stealth, achieved through twin-tail layout, platform edge alignment and serration, body conformal antenna and low intercept radar, diverterless supersonic...
teeth while true piranhas have teeth with multiple cusps, well developed serration and strong compression, making them thin and well suited for cutting....
bears a resemblance to the Marines' iconic Ka-Bar fighting knife with serrations near the handle. For use as an ad-hoc automatic rifle, the M16 and M16A1...
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