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[thahy-meen, -min] /ˈθaɪ min, -mɪn/
noun, Biochemistry.
a pyrimidine base, C 5 H 6 N 2 O 2 , that is one of the principal components of DNA, in which it is paired with adenine. Symbol: T.
Origin of thymine
First recorded in 1890-95; thym(ic)2 + -ine2 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2018.
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Examples from the Web for thymine
Historical Examples
  • The difference between these two bases is one methyl group: thymine is a 5-methyluracil.

    History of Phosphorus Eduard Farber
  • Of the four basic components on the right, thymine occurs in the nucleic acid from the thymus gland.

    History of Phosphorus Eduard Farber
British Dictionary definitions for thymine


a white crystalline pyrimidine base found in DNA. Formula: C5H6N2O2
Word Origin
C19: from thymic (see thymus) + -ine²
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for thymine

1894, from thymic (1868, from Greek thyme; see thyme) + chemical suffix -ine (2).

Online Etymology Dictionary, © 2010 Douglas Harper
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thymine in Medicine

thymine thy·mine (thī'mēn')
A pyrimidine base that is an essential constituent of DNA.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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thymine in Science
A pyrimidine base that is a component of DNA. It forms a base pair with adenine. Chemical formula: C5H6N2O2.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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