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