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stop codon

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noun Genetics.
a codon that stops the synthesis of a protein molecule.
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Also called chain termination codon.
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Scientific definitions for stop codon

stop codon
[ stŏp ]

Any of three codons in a molecule of messenger RNA that do not code for an amino acid and thereby signal the termination of the synthesis of a protein. The three stop codons are UAA, UAG, and UGA, where U is uracil, A is adenine, and G is guanine. Also called termination codon
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
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