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1911 Encyclopedia Britannica
Butterfly and Moth
AND Moth (the former from "butter" and "fly," an old term of uncertain origin, possibly from the nature of the excrement, or the yellow colour of some particular species; the latter akin to O. Eng. mod, an earth-worm), the common English names applied respectively to the two groups of insects forming the scientific order Lepidoptera.
These files are public domain.
Chisholm, Hugh, General Editor. Entry for 'Butterfly and Moth'. 1911 Encyclopedia Britanica. https://www.studylight.org/encyclopedias/eng/bri/b/butterfly-and-moth.html. 1910.