orbicularis oris

Borrowed from New Latin orbiculāris ōris, clipping of mūsculus orbiculāris ōris (“orbicular muscle of the mouth”).

• (Received Pronunciation) IPA^(key): /ɔːˌbɪk.jʊˌlɑː.ɹɪs ˈɒ.ɹɪs/
• (General American) IPA^(key): /ɔɹˌbɪk.jəˌlɛɹ.ɪs ˈɔɹ.ɪs/

orbicularis oris (plural orbiculares orum)

1. (anatomy) A muscle made up of several layers of fibers passing in different directions that surrounds the mouth and controls most movements of the lips (as compressing, closing, or pursing movements).

   Hypernym: orbicularis

   Coordinate term: orbicularis oculi

• “orbicularis oris”, in Lexico, Dictionary.com; Oxford University Press, 2019–2022.
• “orbicularis oris”, in Merriam-Webster Online Dictionary, Springfield, Mass.: Merriam-Webster, 1996–present.