GLOSSARY 591 



corrode, 6-rod'. To eat away gradually, to rust. 



counter-clockwise. Turning in the direction opposite that of a clock's 

 hands. 



Croton, ro' ton. A river northeast of New York City. 



culture, ul' tur, or eta" chur. 1. A growth of microorganisms. 2. A 

 culture medium. 



culture medium. Material in which microorganisms will grow. 



cumulus, u' mu-ltis. A cloud of heap-like form with rounded top. 



cutaneous, U-ta' ne-us. Pertaining to the skin. 



cyclone, c.y' elon. 1. A system of winds several hundred miles in diam- 

 eter, circling around a center. 2. A violent storm occurring over 

 the Indian Ocean. 



decay, de-a/ Rotting, spoiling, putrefying, disintegrating. 



denitrifying, de-m' tri-fy-ing. Removing nitrogen from compounds. 



dew. Water vapor condensed on cool objects as grass or the ground. 



dew-point. The temperature at or below which dew or frost would form. 



dextrin, dSks' trm. One of the carbohydrates. 



dextrose, dSks' tros. Grape sugar, as found in honey. 



diagnosis, di" ag-no' sis. The identification of a disease. 



diaphragm, di' a-fram. A dividing partition or membrane. 



diffused, dl-fusd'. Widely scattered, as a vapor in the air. 



diffusers, dl-fus' ers. Tanks in which the sugar is extracted from beets. 



diffusion, dl-fu'-zhon. The act or process of scattering. 



digestion, di-geV chon. The process of changing food to a soluble and 

 diffusible form. 



diphtheria, dlf-the' ri-a. An acute infectious disease of the throat. 



disinfectant, dls" m-feV tant. A substance which will kill bacteria. 



distillation, dls" tl-la' shun. Operation of separating the more volatile 

 from the less volatile portion of a liquid, as petroleum, or of a solid, 

 as wood or coal. 



divining rod, di-vm' ing. A forked stick by means of which one pre- 

 tends to be able to locate underground veins of water. A rod sup- 

 posed to possess supernatural powers. 



eccentric, 8-c,6n' trie. A wheel having its axle one side of its center. 



efficiency, 6-fIsh' 8n-c.y. Ratio of the useful work to the energy expended. 



enzyme, n' zym. A substance that induces the process of digestion. 



equatorial calms, e" kwa-to' ri-al earns. The belt of calms near the 

 equator. 



equivalent, e-kwlv' a-lnt. Equal in value. 



eureka, u-re' ka. "I have found it." 



evaporate, e-vap' o-rat. To change a liquid to a vapor at a temperature 

 below boiling. 



exhalation, 6ks" ha-la' shon. Breathing out. 



