Webster's Revised Unabridged Dictionary · 1913

Rounding

Rounding , adjective

Round or nearly round; becoming round; roundish.

Rounding , noun

1.
(Nautical) Small rope, or strands of rope, or spun yarn, wound round a rope to keep it from chafing; -- called also service.
2.
(Phonetics) Modifying a speech sound by contraction of the lip opening; labializing; labialization. See Guide to Pronunciation, § 11.