ALL meanings of hydrogen
hy·dro·gen
H h - noun hydrogen a colorless, odorless, flammable gas that combines chemically with oxygen to form water: the lightest of the known elements. Symbol: H; atomic weight: 1.00797; atomic number: 1; density: 0.0899 g/l at 0°C and 760 mm pressure. 1
- noun hydrogen A colorless, odorless, highly flammable gas, the chemical element of atomic number 1. 1
- noun hydrogen colourless gas 1
- noun hydrogen The lightest chemical element (symbol H) with an atomic number of 1 and atomic weight of 1.00794. 0
- noun hydrogen Molecular hydrogen (H2), a colourless, odourless and flammable gas at room temperature. 0
- noun hydrogen An atom of the element. 0
- noun hydrogen A sample of the element. 0
- uncountable noun hydrogen Hydrogen is a colourless gas that is the lightest and commonest element in the universe. 0
- noun hydrogen a flammable colourless gas that is the lightest and most abundant element in the universe. It occurs mainly in water and in most organic compounds and is used in the production of ammonia and other chemicals, in the hydrogenation of fats and oils, and in welding. Symbol: H; atomic no: 1; atomic wt: 1.00794; valency: 1; density: 0.08988 kg/m3; melting pt: –259.34°C; boiling pt: –252.87°C 0
- noun hydrogen (as modifier) 0
- noun hydrogen a flammable, colorless, odorless, gaseous chemical element, the lightest of all known substances: symbol, H; at. no., 1 0