molecule mol·e·cule (mŏl'ĭ-kyōōl')
The smallest particle into which an element or a compound can be divided without changing its chemical and physical properties; a group of atoms that is held together chemically.
|molecule (mŏl'ĭ-kyl') Pronunciation Key
A group of two or more atoms linked together by sharing electrons in a chemical bond. Molecules are the fundamental components of chemical compounds and are the smallest part of a compound that can participate in a chemical reaction.