\hˈa͡ɪdɹəd͡ʒən], \hˈaɪdɹədʒən], \h_ˈaɪ_d_ɹ_ə_dʒ_ə_n]\
Definitions of HYDROGEN
- 2010 - Medical Dictionary Database
- 1919 - The Winston Simplified Dictionary
- 1920 - A practical medical dictionary.
- 1898 - Warner's pocket medical dictionary of today.
- 1899 - The american dictionary of the english language.
- 1894 - The Clarendon dictionary
- 1919 - The Concise Standard Dictionary of the English Language
- 1914 - Nuttall's Standard dictionary of the English language
- 1874 - Etymological and pronouncing dictionary of the English language
- 1846 - Medical lexicon: a dictionary of medical science
- 1898 - American pocket medical dictionary
- 1916 - Appleton's medical dictionary
- 1871 - The Cabinet Dictionary of the English Language
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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.
By DataStellar Co., Ltd
By William Dodge Lewis, Edgar Arthur Singer
An odorless, colorless, tasteless element, gaseous at ordinary temperatures and pressure; symbol H, atomic weight 1. It is the lightest known substance, and the weight of one of its atoms is the unit of atomic weights. It is readily replaceable in many compounds by other elements or radicals, and this substitution of the hydrogen atoms in an acid forms a salt.
By Stedman, Thomas Lathrop
By William R. Warner
By Daniel Lyons
By William Hand Browne, Samuel Stehman Haldeman
By James Champlin Fernald
By Nuttall, P.Austin.
By Stormonth, James, Phelp, P. H.
By Robley Dunglison
By Willam Alexander Newman Dorland
A non-metallic gaseous element. It is one of the components of water and of many other inorganic substances and is a constant constituent of organic compounds. It is a colorless, tasteless, odorless, inflammable gas, and is the lightest substance known, its sp. gr. (air= 1) being 0,0695 and to water as 1 to 11,160. Its density is, accordingly, selected as the unity of density for gases. Under a very low temperature, combined with the application of very great pressure, it is liquefied, forming a bluish, opaque liquid. In composition, it forms the essential element in the class of compounds called acids, which are hence denominated salts of hydrogen, and, united with carbon, it forms the important class of organic compounds called hydrocarbons. In compounds it never replaces more than one atom of another element, and hence its combining power is regarded as a unit, to which that of other elements is referred, and their quantivalence is measured by the number of atoms of hydrogen which they can replace. Atomic weight 1.008 (O= 16.0). Chemical symbol H.
By Smith Ely Jelliffe
Word of the day
- Preparation of copaiba, cubebs, spirit nitrous ether, and liquor potassae. See under Lafayette.