Glossary 619 



Carburetor (kar'bu-ret-er) : A device for mixing air with gasoline. 

 Cardiac opening (karMi-ak) : The opening through which food enters 



the stomach from the esophagus. 

 Cartilage (kar'ti-laj) : Very tough elastic tissue, as the rings of the 



trachea. 



Casualty (kazh'u-al-ti) : An accident resulting in injury or death. 

 Cell: A minute mass of protoplasm usually containing a nucleus and 



enclosed in a cell wall; the unit of structure and function of living 



things ; a source of electrical current. 

 Cell membrane: The thin covering of a cell. 



Cellular (seTu-ldr) : Consisting of, or pertaining to, a cell or cells. 

 Cellulose (seTu-los) : An insoluble substance forming the woody part, 



or walls and coverings, of cells of plants. 



Cement: A powdery material usually made from ground rock contain- 

 ing clay and limestone, or from slag. When moistened, it sets and 



becomes very hard. Used in constructing roads, buildings, and other 



heavy structures. 

 Centigrade (sen'tT-grad) : A thermometer scale on which the freezing 



point of water is and the boiling point 100. 

 Centrifugal force (sen-trif'u-gal) : The force which tends to cause a 



body moving in a curved path to fly off on a straight line. 

 Cerebellum (ser-e-beTwm) : The part of the brain found between the 



cerebrum and the medulla ; regulates the movements of the body. 

 Cerebrum (ser'e-brwm) : The part of the brain above the cerebellum; 



the seat of thought. 



Cesspool: A receptacle at the end of a drain to collect solid material. 

 Characteristic: Distinguishing mark or trait. 



Charcoal: A form of coal made by heating wood in air-tight chambers. 

 Charging: Running an electric current through a storage cell to store 



in it electrical energy in the form of chemical energy. 

 Chemical action (kem'i-kal) : A process by which a chemical change is 



brought about. 

 Chemical change: A change in which the nature or composition of a 



substance becomes new and different, as the burning of coal. 

 Chemical property: A property of a substance which accounts for a 



change in its composition. Wood has the property of burning, that is, 



changing to ashes and gas. 

 Chemistry (kem'is-tri) : The science which treats of the nature of 



substances and of what happens when substances are combined or 



broken up to form new substances. 

 Chlorination (klo-ri-na'shwn) : The process of treating water with 



chlorine gas to kill germs in it. 



Chlorine (klo'rln) : A heavy, poisonous, greenish-yellow gas. 

 Choroid coat (ko'roid) : The middle coat of the eye. 

 Chromosphere (kro'mo-sfer) : A layer of luminous gas, mostly hydro- 

 gen, surrounding the sun. 



Chronometer (kro-nom'e-ter) : A clock used in navigation. 

 Chyle (kil) : Chyme which has been acted upon by bile, pancreatic 



juice, and intestinal juice. 



Chyme (Mm) : Food as it leaves the stomach. 



Cilia (sil'i-d) : Hair-like threads of protoplasm projecting from a cell. 

 Circuit: Movement in a circle or orbit; complete path of an electric 



current. 

 Circulation: The movement of the blood through the arteries, veins and 



capillaries of the human body due to the pumping action of the heart. 



