An Etymological Dictionary of the German Language/Koller
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Koller (1.), n. and m., ‘lady's ruff,’ from MidHG. koller, kollier, gollier, goller, m., ‘neckcloth,’ derived from Fr. collier (Lat. collarium).
Koller, (2.), m., ‘staggers,’ from MidHG. kolre, m., ‘staggers, frenzy, silent rage,’ OHG. cholero, m.; derived, like a number of medical terms, mediately from Gr. χολέρα, Lat. cholera; the ch has also in Rom. the value of a k; comp. Ital. collera, Fr. colère.