reduced to simple curves; made round.

Phonetics . pronounced with rounded lips; labialized

Boot has a rounded vowel. Compare spread def. 40 unrounded.

fully developed, perfected, or complete; diversified and well-balanced (sometimes used in combination)

a well-rounded education; a rounded character.

round 1 ( def. 11 ) .

adjective

arced , arched , arciform , bowed , curved , curvilinear , approximated , balanced , circular , complete , convex , estimated , globular , labialized , orbicular , oval , rotund , spherical