/ Dictionary / Index R rotor cloud: Meaning and Definition of Find definitions for: ro'tor cloud" Pronunciation: [key] a cloud within and around which the air is rotating about a horizontal axis, occurring in the lee of a large mountain barrier. Also called Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. rotor blade rotorcraft Related Content Daily Word Quiz: soporific Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language