A nonmetallic univalent element that is normally a colorless and odorless highly flammable diatomic gas
Noun. 1. hydrogen bond-a chemical bond consisting of a hydrogen atom between two electronegative atoms (e.g., oxygen or nitrogen) with one side be a covalent bond and the other being an ionic bond. bond, chemical bond-an electrical force linking atoms. hydrogen bond. n. 1. (Chemistry) a weak chemical bond between an electronegative atom, such as fluorine, oxygen, or nitrogen, and a hydrogen atom bound to another electronegative atom. 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. Wiktionary (0.00 / 0 votes) Rate this definition: hydrogen (Noun). The lightest chemical element (symbol H) with an atomic number of 1 and atomic weight of 1.00794. hydrogen (Noun). Molecular hydrogen (H), a colourless, odourless and flammable gas at room temperature. hydrogen (Noun). An atom of the element. Hydrogen is a chemical element with chemical symbol H and atomic number 1. With an atomic weight of 7000100794000000000♠1.00794 u, hydrogen is the lightest element on the periodic table. Its monatomic form (H) is the most abundant chemical substance in the universe, constituting roughly 75% of all baryonic mass. Non-remnant stars are mainly composed of hydrogen in its plasma state. A hydrogen bond is the electrostatic attraction between polar molecules that occurs when a hydrogen (H) atom bound to a highly electronegative atom such as nitrogen (N), oxygen (O) or fluorine (F) experiences attraction to some other nearby highly electronegative atom.  1. hydrogen-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. atomic number 1, H. tritium-a radioactive isotope of hydrogen; atoms of tritium have three times the mass of ordinary hydrogen atoms. Symbol H A colorless, odorless, highly flammable gaseous element that is the lightest and most abundant element in the universe. It occurs in water in combination with oxygen, in most organic compounds, and in small amounts in the atmosphere as a gaseous mixture of its three isotopes (protium, deuterium, and tritium). • HYDROGEN (noun). The noun HYDROGEN has 1 sense: 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. Familiarity information: HYDROGEN used as a noun is very rare. Hypernyms (hydrogen is a kind of...): chemical element; element (any of the more than 100 known substances (of which 92 occur naturally) that cannot be separated into simpler substances and that singly or in combination constitute all matter). hydrogen bond. A chemical bond in which a hydrogen atom that is already bonded to an atom in a molecule forms a second bond with another atom, either in the same molecule or in a different one. The second atom is usually of a type that strongly attracts electrons, such as nitrogen or oxygen. hydrogen bond. n. 1. (Chemistry) a weak chemical bond between an electronegative atom, such as fluorine, oxygen, or nitrogen, and a hydrogen atom bound to another electronegative atom. hydrogen bond (Noun). A weak bond in which a hydrogen atom in one molecule is attracted to an electronegative atom (usually nitrogen or oxygen) in the same or different molecule. hydrogen bond (Verb). To bond to another species by means of hydrogen bonds. E.g. Water hydrogen bonds with itself. 
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what does hydrogen mean