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1. (n.) hydrogen
a colorless, odorless, flammable gas, the lightest of the elements, that combines chemically with oxygen to form water.
Etymology: (< F hydrogène (1787); see hydro -1, -gen)
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| Definition of 'Hydrogen' |
Princeton's WordNet |
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1. (noun) hydrogen, H, atomic number 1
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
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1. (noun) hydrogen
a chemical element that is the lightest gas
Hydrogen and oxygen combine to form water.
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| Definition of 'Hydrogen' |
Webster Dictionary |
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1. (noun) Hydrogen
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
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| Definition of 'Hydrogen' |
U.S. National Library of Medicine |
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1. Hydrogen
Hydrogen. The first chemical element in the periodic table. It has the atomic symbol H, atomic number 1, and atomic weight 1. It exists, under normal conditions, as a colorless, odorless, tasteless, diatomic gas. Hydrogen ions are PROTONS. Besides the common H1 isotope, hydrogen exists as the stable isotope DEUTERIUM and the unstable, radioactive isotope TRITIUM.
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| Definition of 'Hydrogen' |
The Standard Electrical Dictionary |
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1. Hydrogen
An element existing under all except the most extreme artificial conditions of pressure and cold as a gas. It is the lightest of known substances. Atomic weight, 1; molecular weight, 2; equivalent, 1; valency, 1; specific gravity, .0691-.0695. (Dumas & Boussingault.)
It is a dielectric of about the same resistance as air. Its specific inductive capacity at atmospheric pressure is: .9997 (Baltzman) .9998 (Ayrton)
Electro-chemical equivalent, .0105 milligram. The above is usually taken as correct. Other values are as follows: .010521 (Kohllrausch) .010415 (Mascart)
The electro-chemical equivalent of any element is obtained by multiplying its equivalent by the electro-chemical equivalent of hydrogen. The value .0105 has been used throughout this book.
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Sense: an element, the lightest gas, which burns and which, when combined with oxygen, produces water.
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 Afrikaans: waterstof |
 Arabic: هيدروجين |
 Bulgarian: водород |
 Brazilian: hidrogênio |
 Czech: vodík |
 German: der Wasserstoff |
 Danish: brint; hydrogen |
 Greek: υδρογόνο |
 Spanish: hidrógeno |
 Estonian: vesinik |
 Farsi: هيدروژن |
 Finnish: vety |
 French: hydrogène |
 Hebrew: מֵימָן |
 Hindi: हाइड्रोजन, उदजन |
 Croatian: vodik |
 Hungarian: hidrogén |
 Indonesian: hidrogen |
 Icelandic: vetni |
 Italian: idrogeno |
 Japanese: 水素 |
 Korean: 수소 |
 Lithuanian: vandenilis |
 Latvian: ūdeņradis |
 Malay: hidrogen |
 Dutch: waterstof |
 Norwegian: vannstoff, hydrogen |
 Polish: wodór |
 Persian: هيدروژن |
 Pashto: هاریدروجن |
 Portuguese: hidrogénio |
 Romanian: hidrogen |
 Russian: водород |
 Slovak: vodík |
 Slovenian: vodik |
 Serbian: hidrogen |
 Swedish: väte |
 Thai: ก๊าซไฮโดรเจน |
 Turkish: hidrojen |
 Taiwanese: 氫 |
 Ukrainian: водень |
 Urdu: ہائڈروجن، ایک بے رنگ، بے |
 Vietnamese: Hyđrô |
 Chinese: 氢 |
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Definitions of Hydrogen 
