What does diphthongize mean?
To diphthongize is to pronounce a vowel as a diphthong — a single syllable whose sound glides continuously from one vowel quality to another, as in the English word 'time,' which begins near an 'ah' and ends near an 'ee.' The term belongs primarily to phonetics and historical linguistics. Descriptively, linguists note that speakers of particular dialects diphthongize certain vowels that other dialects keep pure; historically, they use it to describe sound change, as when long vowels in Middle English gradually became diphthongs during the Great Vowel Shift. It is a formal, technical word, rarely encountered outside academic writing on pronunciation, but precise and indispensable within that domain.
verbTo pronounce or utter a vowel as a diphthong — a gliding sound that changes quality within a single syllable. In phonology and historical linguistics, it can also mean to convert a simple vowel sound into a diphthong over time.
- (Phonetics) Of a speaker or dialect: to pronounce a vowel as a diphthong.
- (Historical linguistics) Of a language: to change a formerly pure vowel into a diphthong.
"In many dialects of English, the vowel in words like 'goat' has diphthongized over the centuries."
"Many speakers diphthongize the vowel in 'cat,' producing a sound closer to 'kyat.'"
"Over several centuries, English underwent a series of shifts that diphthongized the long mid vowels, so 'meat' once rhymed with 'mate.'"
The word for turning a plain vowel into a sliding, double-flavoured sound literally contains the Greek word for 'sound' twice removed — 'diphthong' itself means 'double voice.'
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of diphthongize
Diphthongize derives from 'diphthong,' borrowed in the late Middle Ages from Greek 'diphthongos,' formed from 'di-' meaning 'twice' or 'double' and 'phthongos' meaning 'voice' or 'sound.' The verb was formed by adding the Latinate suffix '-ize' and is attested in scholarly writing on pronunciation from roughly the eighteenth century onward. Its closest relatives are 'diphthong,' 'monophthong,' and 'triphthong,' all built on the same Greek elements.
Related word forms
How diphthongize is actually used
A technical term confined almost entirely to linguistics and phonetics; rare in everyday speech. Usually used intransitively ('the vowel diphthongizes') but can be used transitively ('speakers diphthongize this vowel').
Easily confused with diphthongize
Monophthongize is the opposite process: it means to reduce a diphthong to a single pure vowel sound, whereas diphthongize turns a vowel into a gliding two-part sound.