emerald mothn.Entomology a name applied to certain moths of the genera Hipparchus, Hemithea, and Cleora, distinguished by their bright green colour.
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1845 H. N. Humphreys & J. O. WestwoodBrit. Moths II. 17Hipparchus papilionarius (the large emerald). Hemithea vernaria (the small emerald). Hemithea smaragdaria (the Essex emerald). Cleora bajularia (the blotched emerald).