The story
Partial calque of translingual Rosalia alpina, as rosalia + longicorn.
Etymology from Wiktionary, CC BY-SA 4.0.
Today it means: Rosalia alpina, a species of large, vividly black and blue longhorn beetle found throughout southern Europe and parts of northwest Asia such as the Caucasus. Full definition →
Partial calque of translingual Rosalia alpina, as rosalia + longicorn.
Etymology from Wiktionary, CC BY-SA 4.0.