Pronunciation: (bil'ō), [key]
1. a great wave or surge of the sea.
2. any surging mass: billows of smoke.
1. to rise or roll in or like billows; surge.
2. to swell out, puff up, etc., as by the action of wind: flags billowing in the breeze.
to make rise, surge, swell, or the like: A sudden wind billowed the tent alarmingly.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.