Home › Words › L › lepidopterismlepidopterismlepidopterism · noun — A form of dermatitis caused by irritating caterpillar or moth hairs coming into contact with the skin or mucosa.Definition from Wiktionary (CC BY-SA 3.0).EtymologyFrom Lepidoptera + -ism.nounA form of dermatitis caused by irritating caterpillar or moth hairs coming into contact with the skin or mucosa.Definitions & examples from Wiktionary (CC BY-SA 3.0).