Cornimuse (f)
(with) definite article: laSpelling in Jean Lefèvre (14th century), »La Vieille« (Paris, 1861), vv.199-220, where it is mentioned in combination with a "chalemie" (which seems to support the theory that the latter was a shawm).
Lefèvre, Jean (14th century): "La Vieille". In: Instruments and their music in the Middle Ages, edited by Timothy James McGee (London/New York, 2017).