Compound -- a distinct substance formed by the combination of two or more elements in definite proportions by weight and possessing physical and chemical properties different from those of the combining elements.
(a distinct substance; formed; by the combination of two or more elements in definite proportions by weight and possessing physical and chemical properties different from those of the combining elements)
a distinct substance
formed
by the combination of two or more elements in definite proportions by weight and possessing physical and chemical properties different from those of the combining elements