arcus

(ar’kus), pl. ar’cus [L.]. An arch, bow, or arc. See arch. a. aor’tee, the arch of the aorta. a. dent a’lis, the dental arch. a. glo opal at i’- nus, the anterior pillars of the fauces. a. juvena’lis, a ring around the corneal margin of the iris, sometimes seen in young persons and _ resembling the arcus senilis. a. lumbocosta’lis later a’lis, the lig amentum arcuatum externum. a. lumbocosta'lis media‘lis, the lig amentum arcuatum internum. a. palati’ni, the pillars of the fauces. @ p opalati’‘nus, the posterior pillars of the fauces. a. sen i’lis, a ring of degeneration seen about the corneal periphery in aged persons. a. vola’ris profun'dus, a. v. superficia’lis, the palmar arches. See under arch. &. sygomat’icus, the zygomatic arch.