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countable and uncountable, plural thymines
(organic chemistry, genetics) A heterocyclic base, 5-methylpyrimidine-2,4(1H,3H)-dione; it pairs with adenine in DNA. quotations examples
Then he found them, the substances that made up the four-letter alphabet in whose language all life is written — adenine and cytosine, guanine and thymine.
1997, Ian McEwan, Enduring Love, Vintage (1998), page 164