Compound

n.
  1. That which is compounded or formed by the union or mixture of elements ingredients, or parts; a combination of simples; a compound word; the result of composition.
  2. (Chem.) A union of two or more ingredients in definite proportions by weight, so combined as to form a distinct substance; as, water is a compound of oxygen and hydrogen.
    3. Binary compound (Chem.).
    See under Binary.
    Carbon compounds (Chem.).
    See under Carbon.