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
Word History
Etymology
New Latin, literally, arterial cone
First Known Use
circa 1860, in the meaning defined at sense 1
Medical Definition
conus arteriosus
noun
co·nus ar·te·ri·o·sus ˈkō-nə-sär-ˌtir-ē-ˈō-səs
plural coni arteriosi -ˌnī-är-ˌtir-ē-ˈō-ˌsī, -(ˌ)nē-
: a conical prolongation of the right ventricle from which the pulmonary arteries emerge
called also conus