Definition of unround in US English:

unround

adjective

  • Not round. In later use specifically (in Phonetics): not enunciated with the lips rounded.

verb

  • with object To make (something) no longer round. In later use specifically (in Phonetics): to reduce or eliminate the rounding of the lips when enunciating (a sound, especially a vowel).

Origin

Late 16th century; earliest use found in Cyprian Lucar (1544–?1611). From un- + round<br>early 17th century; earliest use found in Randle Cotgrave (fl. 1587–?1630), lexicographer. From un- + round, originally after French † desrondir.

Pronunciation

unround

/(ˌ)ʌnˈraʊnd/