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Molecule

Definition(s)

A chemical made up of two or more atoms. The atoms in a molecule can be the same (an oxygen molecule has two oxygen atoms) or different (a water molecule has two hydrogen atoms and one oxygen atom). Biological molecules such as proteins and DNA can be made up of many thousands of atoms.: Definition from: Unified Medical Language System (Physician Data Query) at the National Library of Medicine
The smallest particle of a substance that retains all the properties of the substance and is composed of one or more atoms.: Definition from: Merriam-Webster's Medical Dictionary by Merriam-Webster Inc.


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