506 GLOSSARY 



platinum, plat' i-num. A valuable, steel-gray, heavy, malleable metallic 



element, 

 plenum, pie' num. Applied to space full of matter, as plenum system of 



ventilation. 



pneumatic, nu-mat' ic. Pertaining to or containing compressed air. 

 Ponce de Leon, pon' the de le' on. Juan Ponce de Leon, a Spanish 



explorer, 1460-1521. 

 porcelain, pore/ lin, por' ge-lan. A translucent earthenware, usually 



glazed, 

 precipitation, pre-cKp" i-ta' shon. Water from the atmosphere falling 



to or toward the earth. 



propulsion, pro-pin" shon. Pushing; operation of propelling, 

 protein, pro' te-m. One of the three food principles, 

 protractor, pro-trac' tor. An instrument for measuring angles, 

 radiation, ra" di-a' shon. The giving off of heat to or through space, 

 range, rang. 1. A stove with one side as a front. 2. Difference between 



the highest and the lowest, as the range of temperature, 

 relative humidity. The humidity expressed in per cent, of saturation, 

 reservoir, reV er-vwor or re's' er-vwor. A huge tank or receptacle for 



storing water. 



residue, re's' i-du. The portion remaining after part is removed, 

 revolution, rev" o-lu' shon. Complete circuit made by a body around a 



center. 

 Roquefort, rok" for' or rok' fort. A commune in France famed for its 



goats and cheese. 



rotary, ro' ta-ry. Turning around completely on its axis, 

 sanitary, san' i-ta-ry. Relating to the preservation of health, 

 saturation, sach" u-ra' shon. State of being filled with (water) vapor, 

 sedentary, s8d' en-ta-ry. Pertaining to inactivity, as a sedentary life, 

 semi-transparent, sSm" i-trans-par' ent. Partly admitting of the pas- 

 sage of light. 



septic, sep' tie. Productive of putrefaction, rotting or decay, 

 serum, se'rum. Blood with the corpuscles removed. A part of the 



blood. 



sewage, su' ag. Waste matter carried off in sewers, 

 shallot, sha I6t'. An onion-like vegetable used as food, 

 shower, sh6w' er. A brief fall of rain, sometimes of hail or snow. 

 Sierra Nevada, si-Sr' a ne-va' da. A mountain range in eastern Cali- 

 fornia. 



silicon, su" i-kon. One of the chemical elements, found in sand, 

 siphon, si' fon. A bent tube through which liquid flows, 

 sleet, slet. Frozen or partly frozen rain, 

 sludge, sludg. Soft, muddy, pasty, refuse which form in the bottom of a 



septic tank. 



