Phonetics. an unsegmentable, gliding speech sound varying continuously in phonetic quality but held to be a single sound or phoneme and identified by its apparent beginning and ending sound, as the oi- sound of toy or boil.
a digraph, as the ea of meat.
a ligature, as æ.
verb (used with object), verb (used without object)
Sounds of individual letters, digraphs, and diphthongs are blended to form syllables.
Demonstrate difference between pure vowels and diphthongs.
Pronounce long and short vowels, blends, and diphthongs.
Use knowledge of spelling patterns such as diphthongs, and special vowel spellings when reading.
Demonstrate the difference between pure vowels and diphthongs.
British Dictionary definitions for diphthongs
a vowel sound, occupying a single syllable, during the articulation of which the tongue moves from one position to another, causing a continual change in vowel quality, as in the pronunciation of a in English late, during which the tongue moves from the position of (e) towards (ɪ)
a digraph or ligature representing a composite vowel such as this, as ae in Caesar
C15: from Late Latin diphthongus, from Greek diphthongos, from di-1 + phthongos sound
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," related to phthengesthai "utter, speak loudly."