Noun
stop codon (plural stop codon)
English Wikipedia has an article on:stop codonWikipedia
(biology, genetics, biochemistry) a sequence of three RNA nucleotides (A, C, G or U) that instruct the synthesis, or translation, of a protein to stop. The three-letter stop codon sequences have been given names: "UAG" is amber, "UGA" is opal, and "UAA" is ochre.