SINCE 1828
bulbus arteriosus
noun
bulbus ar·te·ri·o·sus
| \ -(ˌ)ärˌtirēˈōsə̇s\
variants:
or less commonly bulbus aortae \ -āˈȯrˌtē \
Definition of bulbus arteriosus
: 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
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