/ Dictionary / Index B billow cloud: Meaning and Definition of Find definitions for: bil'low cloud" Pronunciation: [key] — Meteorol. Meteorol. a cloud consisting of broad, parallel bands oriented perpendicularly to the wind. Also called Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. billow billowy Related Content Daily Word Quiz: cetacean Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language