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Meaning of oystershell scale

oys'ter•shell scale"

Pronunciation: (oi'stur-shel"), [key]
  1. a scale insect, Lepidosaphes ulmi, having a scale shaped like the shell of an oyster, which infests various deciduous trees and shrubs. Also called
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.