noun, plural com·ple·men·ta·ries.
Examples from the Web for complementaries
In the same way mix the two complementaries yellow and blue to produce a gray; mix red and green in the same way.The Mind and Its Education|George Herbert Betts
The answer is that the union is one of complementaries, and not of antitheses.Sex=The Unknown Quantity|Ali Nomad
Greenish-yellow and blue are a pair of complementaries, as already mentioned.
The greatest possible contrast is that of the complementaries.The Painter in Oil|Daniel Burleigh Parkhurst
In a similar way, light and dark tints act as complementaries.The Science of Human Nature|William Henry Pyle