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erosion |
Also found in: Legal, Financial, Encyclopedia, Wikipedia, Hutchinson | 0.01 sec. |
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erosion /ero·sion/ (ĕ-ro´zhun) an eating or gnawing away; a shallow or superficial ulceration; in dentistry, the wasting away or loss of substance of a tooth by a chemical process that does not involve known bacterial action.ero´sive
erosion [irō′zhən] Etymology: L, erodere, to consume the wearing away or gradual destruction of a surface. For example, a mucosal or epidermal surface may erode as a result of inflammation, injury, or other causes, usually marked by the appearance of an ulcer. See also necrosis. erosion (ērō´zh n the chemical or mechanicochemical destruction of tooth substance, the mechanism of which is incompletely known, which leads to the creation of concavities of many shapes at the cementoenamel junction of teeth. The surface of the cavity, unlike dental caries, is hard and smooth. erosion an eating or gnawing away; a shallow or superficial ulceration; in dentistry, the wasting away or loss of substance of a tooth by a chemical process that does not involve known bacterial action. erosion A wearing away, ulceration. See Apple core erosion, Cervical erosion. How to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit webmaster's page for free fun content. |
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Since the summer of 1882, Spencer (no doubt influenced by William Dawson) had become increasing sceptical about the supposed role of continental glaciers in eroding the basins now occupied by the Great Lakes: he then regarded these basins as due primarily to fluvial excavation, modified only slightly by glacial erosion and deposition. The deposit is interpreted to have been formed by the concentration of uranium minerals leached from nearby highly radioactive intrusive rocks and deposited in an old riverbed channel, which was preserved from glacial erosion by a cover of younger volcanic rocks. Cotton (1942) referred to glaciation as a 'climatic accident' and Pauly (1957) referred to 'world-wide abnormal climates" Such events were regarded as being superimposed on static continents where deep glacial erosion and deposition of coarse bouldery sediments such as tills simply interrupted an otherwise orderly Davisian cycle of landscape and sediment evolution from youth to maturity. |
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