conus arteriosus
noun
co·nus ar·te·ri·o·sus
ˈkō-nəs-är-ˌtir-ē-ˈō-səs
plural coni arteriosi
ˈkō-ˌnī-är-ˌtir-ē-ˈō-ˌsī
1
: a conical prolongation of the right ventricle in mammals from which the pulmonary arteries emerge
called also conus
2
: a prolongation of the ventricle of amphibians and some fishes that has a spiral valve separating venous blood going to the respiratory arteries from blood going to the aorta and systemic arteries
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Merriam-Webster unabridged
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