stop codon

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ter·mi·na·tion co·don

trinucleotide sequence (UAA, UGA, or UAG) that specifies the end of translation or transcription. Compare: amber codon, ochre codon, umber codon.
Farlex Partner Medical Dictionary © Farlex 2012

stop codon

n.
Any of three codons, UAA, UAG, or UGA, that signal the termination of the synthesis of a protein. Also called chain termination codon, termination codon.
The American Heritage® Medical Dictionary Copyright © 2007, 2004 by Houghton Mifflin Company. Published by Houghton Mifflin Company. All rights reserved.

stop codon

Any of the 3 codons (or triplets of nucleotides—UAA, UAG and UGA) on an mRNA molecule which lack a cognate aminoacyl tRNA—i.e., do not code for an amino acid and thus signal the end of protein synthesis. When ribosomes hit a stop codon, mRNA transcription is terminated, causing polypeptide synthesis to stop and the ribosome to dissociate from the mRNA.
Segen's Medical Dictionary. © 2012 Farlex, Inc. All rights reserved.

stop codon

Any one of three nucleotide triplets which marks the end of every gene and indicates that protein synthesis ends at that point. The three stop codons are UAG (the amber codon), UAA and UGA. U is uracil, A is adenine and G is guanine.
Collins Dictionary of Medicine © Robert M. Youngson 2004, 2005

stop codon

see NONSENSE CODON.
Collins Dictionary of Biology, 3rd ed. © W. G. Hale, V. A. Saunders, J. P. Margham 2005