/ Dictionary / Index A acicular: Meaning and Definition of Find definitions for: a•cic•u•lar Pronunciation: (u-sik'yu-lur), [key] — adj. needle-shaped. (of cast iron) containing ferrite in a needlelike form. (of an alloy) having a microstructure of needlelike components. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: acicular (Thesaurus) acicula aciculate Related Content Daily Word Quiz: tactful Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language