Definitions for hydrogenˈhaɪ drə dʒən

This page provides all possible meanings and translations of the word hydrogen

Princeton's WordNet

  1. hydrogen, H, atomic number 1(noun)

    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


  1. hydrogen(Noun)

    The lightest chemical element (symbol H) with an atomic number of 1 and atomic weight of 1.00794.

  2. hydrogen(Noun)

    Molecular hydrogen (H), a colourless, odourless and flammable gas at room temperature.

  3. hydrogen(Noun)

    An atom of the element.

  4. hydrogen(Noun)

    A sample of the element.

  5. Origin: From hydrogène, coined by Louis-Bernard Guyton de Morveau, from ὕδωρ + γεννάω.

Webster Dictionary

  1. Hydrogen(noun)

    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

  2. Origin: [Hydro-, 1 + -gen: cf. F. hydrogne. So called because water is generated by its combustion. See Hydra.]


  1. Hydrogen

    Hydrogen is a chemical element with chemical symbol H and atomic number 1. With an atomic weight of 1.00794 u, hydrogen is the lightest element and its monatomic form is the most abundant chemical substance, constituting roughly 75% of the Universe's baryonic mass. Non-remnant stars are mainly composed of hydrogen in its plasma state. At standard temperature and pressure, hydrogen is a colorless, odorless, tasteless, non-toxic, nonmetallic, highly combustible diatomic gas with the molecular formula H2. Most of the hydrogen on Earth is in molecules such as water and organic compounds because hydrogen readily forms covalent compounds with most non-metallic elements. Hydrogen plays a particularly important role in acid–base chemistry with many reactions exchanging protons between soluble molecules. In ionic compounds, it can take a negative charge, or as a positively charged species H+. The latter cation is written as though composed of a bare proton, but in reality, hydrogen cations in ionic compounds always occur as more complex species. The most common isotope of hydrogen is protium with a single proton and no neutrons. As the simplest atom known, the hydrogen atom has been of theoretical use. For example, as the only neutral atom with an analytic solution to the Schrödinger equation, the study of the energetics and bonding of the hydrogen atom played a key role in the development of quantum mechanics.

U.S. National Library of Medicine

  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.

The Standard Electrical Dictionary

  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.

British National Corpus

  1. Written Corpus Frequency

    Rank popularity for the word 'hydrogen' in Written Corpus Frequency: #3805

  2. Nouns Frequency

    Rank popularity for the word 'hydrogen' in Nouns Frequency: #2682

Images & Illustrations of hydrogen

Translations for hydrogen

From our Multilingual Translation Dictionary

Get even more translations for hydrogen »


Find a translation for the hydrogen definition in other languages:

Select another language:

Discuss these hydrogen definitions with the community:

Word of the Day

Would you like us to send you a FREE new word definition delivered to your inbox daily?

Please enter your email address:     


Use the citation below to add this definition to your bibliography:


"hydrogen." STANDS4 LLC, 2015. Web. 1 Dec. 2015. <>.

Are we missing a good definition for hydrogen? Don't keep it to yourself...

Nearby & related entries:

Alternative searches for hydrogen:

Thanks for your vote! We truly appreciate your support.