Definition of peppered moth
: a European geometrid moth (Biston betularia) that typically has white wings with small black specks but also occurs as a solid black form especially in areas where the air is heavily polluted by industry
First Known Use of peppered moth
Learn More about peppered moth
Britannica.com: Encyclopedia article about "peppered moth"
Seen and Heard
What made you want to look up peppered moth? Please tell us where you read or heard it (including the quote, if possible).