noun, plural mont·gol·fi·ers [mont-gol-fee-erz; French mawn-gawl-fyey] /mɒntˈgɒl fi ərz; French mɔ̃ gɔlˈfyeɪ/.
- a balloon raised by air heated from a fire in the lower part.
- Jacques É·tienne [zhahk ey-tyen] /ʒɑk eɪˈtyɛn/, 1745–99, and his brother Jo·seph Mi·chel [zhaw-zef mee-shel] /ʒɔˈzɛf miˈʃɛl/, 1740–1810, French aeronauts: inventors of the first practical balloon 1783.
- obsolete a hot-air balloon
- Jacques Étienne (ʒak etjɛn), 1745–99, and his brother Joseph Michel (ʒozɛf miʃɛl), 1740–1810, French inventors, who built (1782) and ascended in (1783) the first practical hot-air balloon