Approximant

ahd-5
  • noun. A speech sound, such as a glide or liquid, produced by narrowing but not blocking the vocal tract, as by placing an articulator, such as the tongue, near another part of the vocal tract.
  • The Century Dictionary and Cyclopedia
  • Approaching in character; approximating.
  • Wiktionary, Creative Commons Attribution/Share-Alike License
  • noun. a consonant sound made by slightly narrowing the vocal tract, while still allowing a smooth flow of air. Liquids and glides are approximants.
  • noun. An approximation to the solution of a function, series, etc.
  • Word Usage
    "Remember the sonority hierarchy: fricative approximant vowel."