erosion
n.-
1 geological wearing away (n.) B2 Upper Intermediate Sciencethe process where rocks or soil are slowly destroyed and moved by wind, rain, or the sea.
the geological process in which earthen materials are worn away and transported by natural forces such as water or wind.
ExampleThe heavy rain caused serious soil erosion on the farmers' fields.
ExampleCoastal erosion has significantly altered the shoreline over the last decade, threatening several historic structures built near the cliff edge.
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2 figurative loss (n.) C1 Advanced Academicthe gradual loss or weakening of something like power, rights, or value.
the gradual reduction or weakening of an abstract concept, such as authority, value, or social standards.
ExampleHigh prices led to the erosion of the family's savings over time.
ExamplePolitical analysts expressed concern regarding the steady erosion of civil liberties under the new emergency legislation.
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3 medical/dental tissue loss (n.) C1 Advanced Technical Medicinethe wearing away of the surface of a tooth or a shallow sore on the skin.
the loss of the surface of a tissue, such as tooth enamel or mucous membrane, often due to chemical or mechanical action.
ExampleDrinking too many sugary sodas can lead to the erosion of tooth enamel.
ExampleThe physician noted a slight gastric erosion, likely caused by the patient's prolonged use of anti-inflammatory medication.
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4 image processing (n.) C2 Proficiency Technical Computinga way to make the shapes in a digital image thinner or smaller.
a fundamental operation in morphological image processing that shrinks or thins objects in a binary image.
ExampleThe software used erosion to remove the small dots of noise from the scanned photo.
ExampleBy applying a 3x3 structuring element for erosion, the algorithm successfully disconnected the overlapping characters in the digital manuscript.
UsageOften contrasted with 'dilation' in mathematical morphology.
From Middle French erosion, from Latin ērōsiō (“eating away”), derived from ērōdō. The first known occurrence in English was in the 1541 translation by Robert Copland of Guy de Chauliac's medical text The Questyonary of Cyrurygens. Copland used erosion to describe how ulcers developed in the mouth. By 1774 erosion was used outside medical subjects. Oliver Goldsmith employed the term in the more contemporary geological context, in his book Natural History, with the quote : "Bounds are thus put to the erosion of the earth by water."