monophthongize

[ mon-uh f-thawng-ahyz, -gahyz, -thong- ]
/ ˈmɒn əf θɔŋˌaɪz, -ˌgaɪz, -θɒŋ- /
Phonetics

verb (used with object), mon·oph·thong·ized, mon·oph·thong·iz·ing.

to change into or pronounce as a monophthong.

verb (used without object), mon·oph·thong·ized, mon·oph·thong·iz·ing.

to become a monophthong.
Also especially British, mon·oph·thong·ise.

Origin of monophthongize

First recorded in 1875–80; monophthong + -ize

OTHER WORDS FROM monophthongize

mon·oph·thong·i·za·tion, noun