monophthong
noun
mon·oph·thong ˈmä-nə(f)-ˌthȯŋ 
: a vowel sound that throughout its duration has a single constant articulatory position
monophthongal
ˌmä-nə(f)-ˈthȯŋ-(g)əl
adjective 
Word History
Etymology
Late Greek monophthongos single vowel, from Greek mon- + phthongos sound
First Known Use
1616, in the meaning defined above
- planchéite
- plancier
- planck
- Planck
- planck constant
- Planck distribution law
- Planck radiation law
- Planck's constant
- Planckian radiation
- planctonic
- plandok
- plane
- plane angle
- plane at infinity
- plane bit
- plane chart
- plane curve
- plane figure
- plane geometry
- plane iron
- plane man
- plane of defilade
- plane of incidence
- plane of polarization
- plane of projection