Definition of Triplet

Reviewed on 6/3/2021

Triplet: One of three, as: 1. One of three babies in a multiple birth. Or three animals gestated together. 2. In genetics, a set of three bases in DNA. Also called a codon. See: Crick-Brenner experiment. 3. In optics, a combination of three simple lenses cemented together.

The word triplet came into use in the mid-17th century. It was formed from triple, just as doublet was formed from double.

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