Meaning of unrounded

un•round•ed

Pronunciation: (un-roun'did), [key]
— adj. Phonet.
  1. (of a vowel) pronounced without rounding the lips, as the vowel of bit. Cf.(def. 2),(def. 41).
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.