ablation

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Related to ablating: ablative surgery

ablation

1. Medicine the surgical removal of an organ, structure, or part
2. Astronautics the melting or wearing away of an expendable part, such as the heat shield of a space re-entry vehicle on passing through the earth's atmosphere
3. Geology the wearing away of a rock or glacier

ablation

(ab-lay -shŏn) The loss of material from the surface of a moving body as a result of vaporization, friction, etc. For example, atmospheric atoms and molecules erode the surface of a meteoroid and damage the protective heat shield of a returning space shuttle.

Ablation

 

in glaciology, the wasting of the mass of a glacier or snow cover as a result of thawing, evaporation, or mechanical removal—for example, wind ablation or the falling of icebergs. It is caused chiefly by climatic factors.

Three types of ablation are distinguished according to place of appearance: subglacial (or bottom), internal, and surface. The internal heat of the earth, springs (particularly warm ones) surfacing in the glacier bed, and heat caused by the friction of the glacier in its bed are some of the causes of subglacial ablation. Internal ablation is caused by friction between the glacier components and by the circulation of water and air. The glacier surface receives warmth predominantly from solar radiation and from the air. The thermal balance of the glacier surface is the basis of all surface ablation processes. The term “ablation” is sometimes used as well as a synonym for “surface washoff.”

ablation

[ə′blā·shən]
(aerospace engineering)
The intentional removal of material from a nose cone or spacecraft during high-speed movement through a planetary atmosphere to provide thermal protection to the underlying structure.
(geology)
The wearing away of rocks, as by erosion or weathering.
(hydrology)
The reduction in volume of a glacier due to melting and evaporation.
(medicine)
The removal of tissue or a part of the body by surgery, such as by excision or amputation.
References in periodicals archive ?
The results of this test indicate that the cyclic oxidation procedure is very effective for ablating cellulose microfibril carbon in plant cell walls.
(1) The latter work in the infrared region and ablation is largely thermal (material is heated and evaporated), making them limited in "spot size." C[O.sub.2] lasers are not capable of ablating copper foils above 3 [micro]m.
Since its introduction in the 1960's, the C[O.sub.2] laser, which is one of the most efficient and powerful lasers operating in the near-infrared, has been the surgeons' preferred tool for vaporizing, excising, incising and ablating soft tissues.
The procedure takes about 20-30 minutes to perform and is similar in strategy to cryoablation of uterine fibroids, which involves ablating the central vascular supply.
The procedure takes approximately 20-30 minutes to perform and is similar in strategy to cryoablation of uterine fibroids, which involves ablating the central vascular supply.
Such a pattern is produced when light rays reflecting from the top of the ablating material interfere with light rays reflecting from the solid material that remains intact beneath the cloud, which is rapidly expanding upward.
NeuWave Medical's versatile probe portfolio allows the treating physician to tailor the treatment to the patient, maximizing energy delivery and ablating the lesion, while helping to protect non-targeted tissue in the body.
According to officials from Nashua, N.H.-based Resonetics, ablating layers or coatings in a medical device or diagnostic product requires precision, reliability and consistency.
The TrueView Direct autoclavable arthroscope system features single-hand control, allowing for seamless arthroscopy as the second hand can remain on the shaving or ablating device.