condensation nucleus

noun Meteorology.
nucleus ( def 5 ).

Origin:
1910–15

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Dictionary.com's 21st Century Lexicon
Main Entry:  condensation nucleus
Part of Speech:  n
Definition:  any tiny suspended particle in the atmosphere, either liquid or solid, upon which condensation of water vapor begins
Example:  Most condensation nuclei are produced by natural and man-made fires over land and by wave action over the oceans.
Usage:  science
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Example sentences
Quantification is by optical density measurement using condensation nucleus counting technology.
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