Arcus

{ar’-kus) \_arcus, a bow]. A bow or arch. A. dental is, the dental arch. A. senilis, a ring of fatty degeneration seen about the periphery of the cornea in old persons. A. senilis lent is, an opaque ring in the equator of the crystalline lens; it sometimes occurs in the old. A. zygomatic us, the zygomatic arch. 77