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lepidopterology

n. 1 (context biology zoology entomology English) The scientific study of butterfly and moths (the Lepidoptera). 2 lepidoptery

Wikipedia
Lepidopterology

Lepidopterology (from Ancient Greek ( scale) and (wing); and -logia.), is a branch of entomology concerning the scientific study of moths and the three superfamilies of butterflies. Someone that studies in this field is a lepidopterist (or aurelian).