late 15c., from Middle French diphthongue, from Late Latin diphthongus, from Greek diphthongos "having two sounds," from di- "double" (see di- (1)) + phthongos "sound, voice,& [..]

A complex speech sound in which a speaker begins to articulate one vowel and moves to another vowel or semi-vowel sound by switching the position of tongue and lips. For example, in the common name Ro [..]

n. The sound produced by combining two vowels in to a single syllable or running together the sounds.

Speech where two vowels run together.

(n) a vowel sound that starts near the articulatory position for one vowel and moves toward the position for another

Pronunciation GB: ˈdɪfθɒŋ, GA: ˈdɪfθɑŋ A complex vowel which changes its quality within a single syllable. A diphthong has an initial quality and a target quality. Examples from English: eɪ aʊ ɪə, as [..]

A vowel which is articulated with a change in tongue position between the beginning and end, e.g. /ai/ in English or German. Not all diphthongs have phonological status in a language. Historically, di [..]

A gliding monosyllabic speech sound that starts at or near the articulatory position for one vowel and moves to or toward the position of another. For example, oy in TOY or ou in OUT.

a speech sound in which one vowel gradually changes to another vowel within the same syllable. "Oi" in "boil," and "ou" in "out." See also: syneresis.

A monosyllabic vowel combination heard as a single phoneme. When pronouncing a diphthong, a person’s speech articulators transition smoothly from one monophthong to another.

a sound consisting of one or two vowels that is the combination of two sounds said one after the other

a single vowel that glides into two sounds e.g. the "o" in "boy"

 phoneme where the mouth glides from one vowel sound directly into another in the same syllable – both vowels may be heard, but not quite making their usual sounds because of the blending. These include oi, oy, ow, and ou.

(phonetics) diphthong