/ Dictionary / Index F fibratus: Meaning and Definition of Find definitions for: fi•bra•tus Pronunciation: (fī-brā'tus), [key] — adj. Meteorol. (of a cloud) hairlike or striated in composition. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. fibr- fibre Related Content Daily Word Quiz: pertinent Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language