The meaning of COMPOUND is something formed by a union of elements or parts; especially : a distinct substance formed by chemical union of two or more ingredients in definite proportion by weight.

COMPOUND definition: composed of two or more parts, elements, or ingredients. See examples of compound used in a sentence.

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Chemistry A substance made up of two or more elements joined by chemical bonds into a molecule. The elements are combined in a definite ratio. Water, for example, is a compound having two hydrogen …

a word that combines two or more different words. Often, the meaning of the compound cannot be discovered by knowing the meaning of the different words that form it. Compounds may be written …

In chemistry, a compound is a substance that consists of two or more elements. Organic compounds contain carbon in their molecules.

A chemical compound is a pure substance made of two or more different elements that are chemically combined in a fixed ratio. The atoms in a compound are bonded together by strong chemical bonds, …

having or involving two or more actions or functions: The mouth is a compound organ. Grammar of or pertaining to a compound sentence or compound-complex sentence.

Feb 21, 2026 · compound (third-person singular simple present compounds, present participle compounding, simple past and past participle compounded) (transitive) To form (a resulting mixture) …

There are eight meanings listed in OED's entry for the noun compound, two of which are labelled obsolete. See ‘Meaning & use’ for definitions, usage, and quotation evidence.