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

Love words?

You must — there are over 200,000 words in our free online dictionary, but you are looking for one that’s only in the Merriam-Webster Unabridged Dictionary.

Start your free trial today and get unlimited access to America's largest dictionary, with:

• More than 250,000 words that aren't in our free dictionary
• Expanded definitions, etymologies, and usage notes
• Advanced search features
• Ad free!