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oystershell scale

[oi-ster-shel]
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noun
  1. a scale insect, Lepidosaphes ulmi, having a scale shaped like the shell of an oyster, which infests various deciduous trees and shrubs.
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Origin of oystershell scale

An Americanism dating back to 1875–80; oyster + shell
Also called oyster scale.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018