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onglide

noun

noun Definition from Wiktionary (CC BY-SA). More about onglide at Wordnik → Where our words come from →

  1. A phase while the articulators are moving into position to produce a new speech sound.
  2. The first, weaker part of a complex vowel, such as a diphthong, as the /j/ sound of the /juː/ in English few.

verb

  1. To produce this sound.

Origin

From on- + glide. Compare Middle English ongliden (“to glide over”).

From Wiktionary, via Kaikki.org (CC BY-SA)