orbicular muscles

pl. Anat.: Two muscles: (1) Orbicularis or is, an orbicular muscle with concentric fibers around the orifice of the mouth; called also sphincter or is . (2) Orbicularis palpebra rum , a thin elliptical muscle surrounding the fi ure between the eyelids, covering their surface, and spreading some distance around. orbicular-proce , s. Anat .: The orbicular bone of childhood, which in the adult becomes a flattened rounded tubercle at the end of the long proce of the incus, and articulates with the stapes. or-bic-u-lar-ly, adv . [Eng. orbicular ; -ly .] In an orbicular, spherical, or circular manner; spherically, circularly.