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Meaning of excrescent

ex•cres•cent

Pronunciation: (ik-skres'unt), [key]
— adj.
  1. growing abnormally out of something else; superfluous.
  2. (of a speech sound) inserted or added as a result of articulatory interaction or impetus, as the t-sound in sense (sents) or against (from Middle English ageynes), without grammatical or historical justification; intrusive; parasitic.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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