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approximant

[uh-prok-suh-muh nt]
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noun Phonetics.
  1. an articulation in which one articulator is close to another, but not sufficiently so to form a stop or a fricative.
  2. a sound characterized by such an articulation, as (w), (y), (r), (l), or a vowel.
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Origin of approximant

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018