Cilia (pl. of _cilium_, an eyelash). Minute hair-like processes found upon the cells of the air passages and other parts. Ciliary Muscle. A small muscle of the eye which assists in accommodation. Circumvallate (Lat. _circum_, around, and _vallum_, a rampart). Surrounded by a rampart, as are certain papillæ of the tongue. Coagulation (Lat. _coagulo_, to curdle). Applied to the process by which the blood clots or solidifies. Cochlea (Lat. _cochlea_, a snail shell). The spiral cavity of the internal ear. Columnæ Carneæ. Fleshy projections in the ventricles of the heart. Commissure (Lat. _con_, together, and _mitto_, _missum_, to put). A joining or uniting together. Compress. A pad or bandage applied directly to an injury to compress it. Concha (Gr. κόγχη, a mussel shell). The shell-shaped portion of the external ear. Congestion (Lat. _con_, together, and _gero_, to bring). Abnormal gathering of blood in any part of the body. Conjunctiva (Lat. _con_, together, and _jungo_, to join). A thin layer of mucous membrane which lines the eyelids and covers the front of the eyeball, thus joining the latter to the lids. Connective Tissue. The network which connects the minute parts of most of the structures of the body. Constipation (Lat. _con_, together, and _stipo_, to crowd close). Costiveness. Consumption (Lat. _consumo_, to consume). A disease of the lungs, attended with fever and cough, and causing a decay of the bodily powers. The medical name is _phthisis_. Contagion (Lat. _con_, with, and _tango_ or _tago_, to touch). The communication of disease by contact, or by the inhalation of the effluvia of a sick person. Contractility (Lat. _con_, together, and _traho_, to draw). The property of a muscle which enables it to contract, or draw its extremities closer together. Convolutions (Lat. _con_, together, and _volvo_, to roll). The tortuous foldings of the external surface of the brain. Convulsion (Lat. _convello_, to pull together). A more or less violent agitation of the limbs or body. Coördination. The manner in which several different organs of the body are brought into such relations with one another that their functions are performed in harmony. Coracoid (Gr. κόραξ, a crow, εἶδος, form). Shaped like a crow’s beak. Cornea (Lat. _cornu_, a horn). The transparent horn-like substance which covers a part of the front of the eyeball. Coronary (Lat. _corona_, a crown). A term applied to vessels and nerves which encircle parts, as the _coronary_ arteries of the heart. Coronoid (Gr. κορώνη, a crow). Like a crow’s beak; thus the _coronoid_ process of the ulna. Cricoid (Gr. κρίκος, a ring, and εἶδος, form). A cartilage of the larynx resembling a seal ring in shape. Crystalline Lens (Lat. _crystallum_, a crystal). One of the humors of the eye; a double-convex body situated in the front part of the eyeball.