either of two angles that added together produce an angle of 90°.
either of two angles whose sum is 90° Compare supplementary angle
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.
plural noun, Botany. 1. cells fitting closely together in the lenticel.
- Complementary closing
noun complimentary close Examples We all could use a list of complementary closings so we stop using the same tired ones. Word Origin complements’ the salutation
noun 1. Art. 2. . complementary color A secondary color that, when combined with the primary color whose wavelength it does not contain, produces white light. Thus yellow, which is produced by mixing the primary colors red and green, is the complementary color of blue. See Note at color.
- Complementary colour
noun 1. one of any pair of colours, such as yellow and blue, that give white or grey when mixed in the correct proportions