bulbus arteriosus
noun
bulbus ar·te·ri·o·sus
-(ˌ)ärˌtirēˈōsə̇s
variants or less commonly bulbus aortae
-āˈȯrˌtē
: the dilated part of the aorta just in front of the heart from which the aortic arches arise in vertebrate embryos and in the adult of many lower vertebrates
Word History
Etymology
New Latin bulbus arteriosus, literally, arterial bulb & bulbus aortae, literally, bulb of the aorta