/ Dictionary / Index I infundibulum: Meaning and Definition of Find definitions for: in•fun•dib•u•lum Pronunciation: (in"fun-dib'yu-lum), [key] — pl. -la a funnel-shaped organ or part. a funnel-shaped extension of the hypothalamus connecting the pituitary gland to the base of the brain. a space in the right ventricle at the base of the pulmonary artery. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: infundibulum (Thesaurus) infundibuliform infuriate Related Content Daily Word Quiz: spectral Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language