/ Dictionary / Index F fibrilla: Meaning and Definition of Find definitions for: fi•bril•la Pronunciation: (fī-bril'u, fi-), [key] — pl. -bril•lae a fibril. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. fibril fibrillate Related Content Daily Word Quiz: vertigo Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language