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Definition of molecule

molecule

/ˈmɑː.lə.kjuːl/
mol · e · cule
Adverb:molecularly
•
Plural:molecules
•
Adjective:molecular
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molecule Lexical Profile

molecule Game Scores & Validity

• noun

1

The smallest fundamental unit of a chemical compound that can take part in a chemical reaction, typically consisting of two or more atoms held together by chemical bonds.

Example

"A single water molecule is composed of two hydrogen atoms covalently bonded to one oxygen atom."

2

A very small piece, fragment, or amount of something.

Example

"The defense attorney argued that there was not a single molecule of evidence connecting her client to the crime."

Synonyms
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Antonyms
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• Rhymes for molecule

• Nearby Words

mole kingsnake
mole snake
molecular
molecule
molehill
moleskin
molest

Word Origin & Etymology

Derived in the 17th century from the French word 'molécule', which comes from the Modern Latin 'molecula', a diminutive form of the Latin 'moles' meaning 'mass' or 'barrier'.

Usage Trend

Historical frequency of usage in published text.

180019102020
Data source: Google Books Ngram Viewer

Cite this Entry

Wordmom. (2026). Definition of Molecule. In Wordmom Dictionary. Retrieved Nov 5, 2026, from https://wordmom.com/dictionary/molecule
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