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compound

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noun compound pronunciation in British English /ˈkɒmpaʊnd/ 
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singularcompound
pluralcompounds
  1. 1
    [countable] chemistry a chemical substance that consists of two or more elements that together form a molecule. Each different compound has a fixed ratio of elements. For example the water compound (H2O) consists of two hydrogen atoms and one oxygen atom

    Why do chemical compounds behave as they do?

    Water is a compound of hydrogen and oxygen.

    1. a.
      [countable/uncountable] something that consists of two or more substances mixed together

      a herbal compound used for treating headaches

  2. 2
    [countable] a combination of things

    John and Steve working together? That's a lethal compound.

pre-cation

a paid holiday given to a new employee before they start their job

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