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Webster 1913 Edition

Adj.

(Phonetics)

Modified by contraction of the lip opening; labialized; labial. See Guide to Pronunciation, § 11.

rounded

rounded ‎(comparative more rounded, superlative most rounded)

Made into a circle or sphere.
Complete or balanced.
(mathematics) Describing a number that has been changed to its nearest desired value.
(botany) Ending in a broad arch.
(linguistics, of a vowel) Pronounced with the lips drawn together; see rounded vowel.

made into a circle or a sphere

pronounced with the lips drawn together