noun, masculine/feminine/fla.ʒɔ.lɛ.tist/plural: flageolettistes
flageoletist
From flageolet + -iste. The French diminutive suffix -et (from Late Latin -ittus or -ettus) usually becomes -ett- before the addition of other suffixes (e.g. sonnettiste, motettiste, juillettiste, cornettiste, galoubettiste).