Pronunciation: (kō'nus är-tēr"ē-ō'sus), [key]
—pl. co•ni ar•te•ri•o•siPronunciation: (kō'nī är-tēr"ē-ō'sī, kō'nē är-tēr"ē-ō'sē). [key] Anat., Zool.
the most anterior part of the simple tubular heart of lower vertebrates and embryos of higher vertebrates, leading into the artery that leaves the heart; in mammals it forms a part of the upper wall of the right ventricle, in which the pulmonary artery originates. Also called co'nus.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.