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peppered moth
pep·pered moth (plural pep·pered moths)


noun 
Definition:
 
moth that changes color: a moth that is gray and speckled when found in rural areas and black in smoke-darkened industrial regions. Latin name Biston betularia.
Encarta® World English Dictionary [North American Edition] © & (P)2009 Microsoft Corporation. All rights reserved. Developed for Microsoft by Bloomsbury Publishing Plc.
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