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Table of Contents -- hydrogen POS
HYPHEN
WORDNET DICTIONARY
CIDE DICTIONARY
OXFORD DICTIONARY
ROGET THESAURUS

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hydrogen

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POS

Noun

HYPHEN

hy=dro=gen

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WORDNET DICTIONARY

Noun hydrogen has 1 sense

hydrogen(n = noun.substance) atomic number 1, h - a nonmetallic univalent element that is normally a colorless and odorless highly flammable diatomic gas; the simplest and lightest and most abundant element in the universe;

has particulars: tritium

is a kind of chemical element, element, gas

Derived form verb hydrogenate₁

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CIDE DICTIONARY

hydrogen, n. [Hydro-, 1 + -gen: cf. F. hydrogène. So called because water is generated by its combustion. See Hydra.].

A gaseous element, colorless, tasteless, and odorless, the lightest known substance, being fourteen and a half times lighter than air (hence its use in filling balloons), and over eleven thousand times lighter than water. It is very abundant, being an ingredient of water and of many other substances, especially those of animal or vegetable origin. It may by produced in many ways, but is chiefly obtained by the action of acids (as sulphuric) on metals, as zinc, iron, etc. It is very inflammable, and is an ingredient of coal gas and water gas. It is standard of chemical equivalents or combining weights, and also of valence, being the typical monad. Symbol H. Atomic weight 1. [1913 Webster]

" Although a gas, hydrogen is chemically similar to the metals in its nature, having the properties of a weak base. It is, in all acids, the base which is replaced by metals and basic radicals to form salts. Like all other gases, it is condensed by great cold and pressure to a liquid which freezes and solidifies by its own evaporation. It is absorbed in large quantities by certain metals (esp. palladium), forming alloy-like compounds; hence, in view of quasi-metallic nature, it is sometimes called hydrogenium. It is the typical reducing agent, as opposed to oxidizers, as oxygen, chlorine, etc." [1913 Webster]

Bicarbureted hydrogen, an old name for ethylene. -- Carbureted hydrogen gas. See under Carbureted. -- Hydrogen dioxide, a thick, colorless liquid, H2O2, resembling water, but having a bitter, sour taste, produced by the action of acids on barium peroxide. It decomposes into water and oxygen, and is manufactured in large quantities for an oxidizing and bleaching agent. Called also oxygenated water.<-- usually "hydrogen peroxide", or "peroxide" in weak solutions used as an antiseptic--> -- Hydrogen oxide, a chemical name for water, H -- Hydrogen sulphide, a colorless inflammable gas, H2S, having the characteristic odor of bad eggs, and found in many mineral springs. It is produced by the action of acids on metallic sulphides, and is an important chemical reagent. Called also sulphureted hydrogen.

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OXFORD DICTIONARY

hydrogen, n. Chem. a colourless gaseous element, without taste or odour, the lightest of the elements and occurring in water and all organic compounds.

Idiom

hydrogen bomb an immensely powerful bomb utilizing the explosive fusion of hydrogen nuclei: also called H-BOMB. hydrogen bond a weak electrostatic interaction between an electronegative atom and a hydrogen atom bonded to a different electronegative atom. hydrogen peroxide a colourless viscous unstable liquid with strong oxidizing properties.

Usage

Chem. formula: H2S

Derivative

hydrogenous adj.

Etymology

F hydrog{egrave}ne (as HYDRO-, -GEN)

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ROGET THESAURUS

hydrogen

Fuel

N fuel, firing, combustible, coal, wallsend, anthracite, culm, coke, carbon, charcoal, bituminous coal, tar shale, turf, peat, firewood, bobbing, faggot, log, cinder, ingle, tinder, touchwood, sulphur, brimstone, incense, port-fire, fire-barrel, fireball, brand, amadou, bavin, blind coal, glance coal, German tinder, pyrotechnic sponge, punk, smudge, solid fueled rocket, wax, paraffin wax, paraffin oil, lamp oil, whale oil, oil, petroleum, gasoline, high octane gasoline, nitromethane, petrol, gas, juice, gasohol, alcohol, ethanol, methanol, fuel oil, kerosene, jet fuel, heating oil, number 2 oil, number 4 oil, naphtha, rocket fuel, high specific impulse fuel, liquid hydrogen, liquid oxygen, lox, natural gas, synthetic gas, synthesis gas, propane, butane, hydrogen, brand, torch, fuse, wick, spill, match, light, lucifer, congreve, vesuvian, vesta, fusee, locofoco, linstock, candle, oil, carbonaceous, combustible, inflammable, high octane, high specific impulse, heat of combustion.

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