o

Noun
  1. A nonmetallic bivalent element that is normally a colorless odorless tasteless nonflammable diatomic gas;
    Constitutes 21 percent of the atmosphere by volume;
    The most abundant element in the earth's crust (synset 114672278)
    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: liquid oxygen, lox - a bluish translucent magnetic liquid obtained by compressing gaseous oxygen and then cooling it below its boiling point; used as an oxidizer in rocket propellants
    substance meronym:
    • air - a mixture of gases (especially oxygen) required for breathing; the stuff that the wind consists of
    • 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
    • ozone - a colorless gas (O3) soluble in alkalis and cold water; a strong oxidizing agent; can be produced by electric discharge in oxygen or by the action of ultraviolet radiation on oxygen in the stratosphere (where it acts as a screen for ultraviolet radiation)
    same as: atomic number 8, oxygen
  2. The 15th letter of the Roman alphabet (synset 106845730)
    is a type of: alphabetic character, letter, letter of the alphabet - the conventional characters of the alphabet used to represent speech
    belongs to: latin alphabet, roman alphabet - the alphabet evolved by the ancient Romans which serves for writing most of the languages of western Europe
  3. The blood group whose red cells carry neither the A nor B antigens (synset 105408572)
    "people with type O blood are universal donors"
    is a type of: blood group, blood type - human blood cells (usually just the red blood cells) that have the same antigens
    same as: group o, type o

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