Col lapsus

(kol-aps' -us)cornea.. Collapse. C. corneae, entire collapse of the Collar (kol'-ar). Something worn about the neck. C, Adjusting, in microscopes, a ring or collar acting on a screw to increase or decrease the distance between the systems of lenses of an objective. C.-bone. See Clavicle . C.-cell, in biology, a flagellate cell having the base of the flagellum surrounded bya collar-like extension of the cell-wall. C. -crown, in dentistry, an artificial crown, to be engrafted on a natural root, attached to which is a gold collar which encircles the exposed portion of the root, and is soldered to the lining or backing that holds the dowel, or to the dowel by means of a disc between the base of the artificial crown and the natural root.