WordReference Random House Unabridged Dictionary of American English © 2025
com′plemen′tary base′, [Genetics.]
  1. Geneticseither 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. Cf. base pair.


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