a European geometrid moth, Biston betularia, occurring in a pale grey speckled form in rural areas and a black form in industrial regionsSee also melanism (def. 1)
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Words nearby peppered moth
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012