hydrogen

Noun
  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 (synset 114664612)
    is a type 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
    • gas - a fluid in the gaseous state having neither independent shape nor volume and being able to expand indefinitely
    subtypes: tritium - a radioactive isotope of hydrogen; atoms of tritium have three times the mass of ordinary hydrogen atoms
    substance meronym: h2o, water - 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
    same as: atomic number 1, h

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