Definition of thymine in English:

Share this entry


Pronunciation: /ˈTHīˌmēn/
Pronunciation: /ˈTHīəmən/


A compound that is one of the four constituent bases of nucleic acids. A pyrimidine derivative, it is paired with adenine in double-stranded DNA.
  • Alternative name; 5-methyluracil; chemical formula: C5H6N2O2.
Example sentences
  • The derivatives of purine are called adenine and guanine, and the derivatives of pyrimidine are called thymine, cytosine and uracil.
  • Of the four bases that make up DNA - adenine, thymine, cytosine and guanine - only cytosine has the potential to be methylated in humans and most mammals.
  • In DNA the bases pair to form a ladder-like structure, with adenine paired with thymine and guanine with cytosine.


Late 19th century: from thymus + -ine4.

For editors and proofreaders

Syllabification: thy·mine

Share this entry

What do you find interesting about this word or phrase?

Comments that don't adhere to our Community Guidelines may be moderated or removed.