598 GLOSSARY 



vibrating, vl' brat-ing. Moving back and forth in a straight line or the 

 arc of a circle. 



virulence, vlr' u-lgnc. The disease producing property of an organism. 



virus, vl' rtis. The substance used in vaccination. 



vitality, vi-tal' i-ty. Life; power; surplus energy. 



vitiated, vlsh' i-at" ed. Polluted; impure. 



volatile, vQl' a-tfl. Easily evaporated. 



waterspout. A tornado occurring over water. 



Welsbach, wls' bac. Carl Auer Freiherr Welsbach, an Austrian scient- 

 ist, 1858- 



westerlies. The belt or zone of winds blowing from the west in both 

 temperate zones. 



xerophyte, ze' ro-fite. A plant which thrives in dry soil and dry air. 



yucca, yue' a. Lilly-like plant, a native of southwestern United States 

 and Mexico. 



