Definition of molecular clock in English:

molecular clock

Syllabification: mo·lec·u·lar clock

Entry from US English dictionary

noun

Genetics
The average rate at which a species' genome accumulates mutations, used to measure their evolutionary divergence and in other calculations.

Definition of molecular clock in:

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Word of the day brannigan
Pronunciation: ˈbranɪg(ə)n
noun
a brawl or violent argument