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complementary base

noun, Genetics.
1.
either of the nucleotide bases linked by a hydrogen bond on opposite strands of DNA or double-stranded RNA: guanine is the complementary base of cytosine, and adenine is the complementary base of thymine in DNA and of uracil in RNA.
Compare base pair.
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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