Webster dictionary was developed by Noah Webster in the beginning of 19th century. On this website, you can find definition for molecule from the 1913 edition of Webster's Revised Unabridged Dictionary. Define molecule using one of the most comprehensive free online dictionaries on the web.

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molecule
Part of Speech: noun
Results: 3
1. One of the very small invisible particles of which all matter is supposed to consist.
2. The smallest part of any substance which possesses the characteristic properties and qualities of that substance, and which can exist alone in a free state.
3. A group of atoms so united and combined by chemical affinity that they form a complete, integrated whole, being the smallest portion of any particular compound that can exist in a free state; as, a molecule of water consists of two atoms of hydrogen and one of oxygen. Cf. Atom.
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