Glossary 629 



Inoculate (m-6k'u-lat) : To put infectious matter into the flesh of a 



person to protect him against a disease. 

 Inorganic (ln-6r-gan'ik) : A term applied to matter that is and always 



has been lifeless. 

 Insect: A small creature without a backbone. Its body is divided into 



three segments. 



Insoluble (in-sol'u-b'l) : Incapable of being dissolved. 

 Inspiration: Act of breathing in. 

 Insulation (in-su-la'shftn) : Act of separating a body from others by 



non-conducting material so as to prevent the transfer of electricity or 



heat. 

 Insulin (in'sw-lm) : A secretion of the pancreas necessary for the 



assimilation of sugar. 



Integument (in-teg'u-m<?nt) : A thin inner covering in some seeds. 

 Intensity: Degree or amount, as, for example, of sound. 

 Intestinal juice: A ferment in the small intestine which neutralizes 



acids and aids digestion. 

 Intestine: The tube in vertebrates through which food passes after 



leaving the stomach; divided into the small and the large intestines. 

 Involuntary muscles: Muscles which perform movements not under 



the guidance of the will, such as the beating of the heart. 

 Iodine: A chemical substance prepared from a seaweed. In solution 



it is used as a test for starch and as a disinfectant. 

 Iris: The adjustable diaphragm of the eye which regulates the amount 



of light striking the lens. 



Iron: A solid, heavy, grayish- white metal. One of the elements. 

 Irrigate: To moisten the land for agriculture by causing water to flow 



over or through it. 

 Isobar (i'so-bar) : A line on a weather map connecting the places where 



the atmospheric pressure is the same at a given time. 

 Isolated (i'so-lat-ed) : Separated from others; put by itself. 

 Isotherm (i's6-thurm) : A line on a weather map connecting places in 



which the temperature is the same at a given time. 



J 



Jacketed stove: A stove surrounded by a wall of sheet iron, which 

 serves to distribute heat more evenly. 



K 



Kerosene: An oil used for lighting purposes; obtained from petroleum. 



Kidneys: The two glands which excrete urine. 



Kilowatt (kil'6-wot) : A unit of power in electrical measurement which 



is equal to 1000 watts. 

 Kilowatt hour: The amount of work done by one kilowatt, 1000 watts, 



of electric current in one hour. 

 Kindling temperature: The temperature at which a substance will take 



fire. 

 Kinetic energy (ki-net'ik) : The energy of motion. 



L 



Lacerated wound (las'er-at-ed) : A wound in which the skin and the 



tissues beneath are torn instead of cut. 

 Lacteals (lak'te-alz) : Tube-like channels which carry fats from the 



small intestine to the thoracic duct. 



