Pronunciation: (in"fun-dib'yu-lum), [key]
—pl. -laPronunciation: (-lu). [key] Anat.
1. a funnel-shaped organ or part.
2. a funnel-shaped extension of the hypothalamus connecting the pituitary gland to the base of the brain.
3. 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.