start codon


: a genetic codon in messenger RNA that stimulates the binding of a transfer RNA which starts protein synthesis
… the AUG codon for methionine functions as the start codon in the vast majority of mRNAs.Harvey Lodish et al., Molecular Cell Biology, 6th edition

called also initiation codon

compare stop codon

Dictionary Entries Near start codon

Cite this Entry

“Start codon.” Medical Dictionary, Merriam-Webster, Accessed 1 Feb. 2023.

Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!

The Great British Vocabulary Quiz

  • union jack speech bubble
  • Named after Sir Robert Peel, what are British police called?
Name That Thing

You know what it looks like… but what is it called?

Solve today's spelling word game by finding as many words as you can with using just 7 letters. Longer words score more points.

Can you make 12 words with 7 letters?