monophthong
Noun
Meaning
A single uncompounded vowel sound.
A combination of two written vowels pronounced as one; a digraph.
Source: Webster's dictionarySynonyms
consonant
liquid
explosive
modification
lateral
nasal
assimilation
articulation
mute
glide
aspiration
pharyngeal
labial
guttural
phone
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Examples
An early change that separated Runic Danish from the other dialects of Old East Norse was the change of the diphthong æi to the monophthong é, as in stæinn to sténn "stone".
Vowel breaking or diphthongization is a vowel shift in which a monophthong becomes a diphthong.