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| ether |
a very volatile, flammable liquid compound of hydrogen, carbon, and oxygen, used as a solvent and formerly as an anesthetic. [1/4 definitions] |
| ethyl chloride |
a gas that becomes a volatile flammable liquid under pressure, made from ethyl alcohol and hydrogen chloride and used as a solvent and local anesthetic and in the making of tetraethyl lead. |
| fat |
animal or plant substance that is composed of carbon, hydrogen, and oxygen, is greasy to the touch, and is white or yellowish in color. [1/10 definitions] |
| fluorocarbon |
any of various organic chemical compounds resulting from the substitution of fluorine for hydrogen in a hydrocarbon, used in refrigeration, lubrication, plastic and resin manufacture, as a fire extinguisher, and formerly as the propellant in aerosol cans. |
| formaldehyde |
a colorless, water-soluble gas of hydrogen, carbon, and oxygen, with a strong, irritating odor, used in the manufacture of various resins, dyes, and plastics and as a disinfectant and embalming agent. |
| fuel cell |
any of various devices in which continuous electrical energy is produced from the reaction between a fuel, such as liquid hydrogen, and an oxidant. |
| fusion bomb |
see "hydrogen bomb." |
| H |
symbol of the chemical element hydrogen. |
| H-bomb |
a nuclear bomb with extremely destructive explosive power, that releases energy by the fusing of hydrogen nuclei; hydrogen bomb. |
| heavy hydrogen |
an isotope of hydrogen with a mass number greater than one; deuterium. |
| hydrazine |
a colorless and corrosive fuming liquid substance of nitrogen and hydrogen that is used in rocket and jet fuels. |
| hydric |
of, containing, or concerning hydrogen. [1/2 definitions] |
| hydride |
an inorganic compound, such as sodium hydride, containing hydrogen and a second usu. electropositive element or group. |
| hydro- |
hydrogen. [1/2 definitions] |
| hydrocarbon |
any of various organic compounds that contain only hydrogen and carbon, such as methane or ethylene. |
| hydrochloric acid |
a strong poisonous acid of hydrogen and chlorine in a water solution, esp. used for industrial and chemical purposes. |
| hydrocyanic acid |
a highly poisonous, flammable solution of hydrogen cyanide in water, used in manufacturing, working with metals, and the like; prussic acid. |
| hydrofluoric acid |
a highly poisonous water solution of hydrogen fluoride, colorless and corrosive, used esp. in etching glass. |
| hydrogenate |
to treat or cause to combine with hydrogen. |
| hydrogen bomb |
an extremely powerful bomb whose destructive energy comes from the fusion of hydrogen nuclei under intense heat and pressure, forming helium nuclei. |
| hydrogen ion |
the positive ion of a hydrogen atom whose electron has been removed, as in acids. |
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