hydrogen
English Thesaurus
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 (noun.substance)
| hypernym | : | chemical element, element, |
| definition | : | 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 (noun.substance) |
| hypernym | : | gas, |
| definition | : | a fluid in the gaseous state having neither independent shape nor volume and being able to expand indefinitely (noun.substance) |
| hyponym | : | tritium, |
| definition | : | a radioactive isotope of hydrogen; atoms of tritium have three times the mass of ordinary hydrogen atoms (noun.substance) |
| substance meronym | : | h2o, water, |
| definition | : | binary compound that occurs at room temperature as a clear colorless odorless tasteless liquid; freezes into ice below 0 degrees centigrade and boils above 100 degrees centigrade; widely used as a solvent (noun.substance) |
| derivation | : | hydrogenate, |
| definition | : | combine or treat with or expose to hydrogen; add hydrogen to the molecule of (an unsaturated organic compound) (verb.change) |
| derivation | : | hydrogenate, |
| definition | : | combine or treat with or expose to hydrogen; add hydrogen to the molecule of (an unsaturated organic compound) (verb.change) |
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