Breadcrumb Home > Dictionary > Index A astilbe: Meaning and Definition of Find definitions for: a•stil•be Pronunciation: (u-stil'bē), [key] — n. any plant of the genus Astilbe, of the saxifrage family, having spirelike clusters of small white, pink, or reddish flowers. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: astilbe (Thesaurus) astigmoscope astir ✖ Related Content Daily Word Quiz: rocrustean Analogy of the Day: Today’s Analogy Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language