noun, feminine/mɔ.nɔf.tɔ̃ɡ/plural: monophtongues
monophtongue is feminine in French.
monophthong
Related: monophtongaison, monophtonguer
Borrowed from Latin monophthongos or monophthongus, itself a borrowing from Ancient Greek μονόφθογγος (monóphthongos, “monophthong”).