[hahy-droh-frak-cher-ing, hahy-droh-frak-] /ˌhaɪ droʊˈfræk tʃər ɪŋ, ˈhaɪ droʊˌfræk-/
a process in which fractures in rocks below the earth’s surface are opened and widened by injecting chemicals and liquids at high pressure: used especially to extract natural gas or oil.
[hahy-druh-jel] /ˈhaɪ drəˌdʒɛl/ noun 1. a whose liquid constituent is water. /ˈhaɪdrəˌdʒɛl/ noun 1. a gel in which the liquid constituent is water hydrogel hy·dro·gel (hī’drə-jěl’) n. A colloidal gel in which the particles are dispersed in water.
[hahy-druh-juh n] /ˈhaɪ drə dʒən/ noun 1. a colorless, odorless, flammable gas that combines chemically with oxygen to form water: the lightest of the known elements. Symbol: H; atomic weight: 1.00797; atomic number: 1; density: 0.0899 g/l at 0°C and 760 mm pressure. /ˈhaɪdrɪdʒən/ noun 1. n. 1791, from French hydrogène, coined 1787 by G. […]
hydrogen-1 n. The most abundant isotope of hydrogen, having atomic mass 1. Also called protium.
hydrogen-2 n. See deuterium.