complementary color, complementary -- (either one of two chromatic colors that when mixed together give white (in the case of lights) or grey (in the case of pigments); "yellow and blue are complementaries")
Overview of adj complementary
The adj complementary has 2 senses
complementary -- (of words or propositions so related that each is the negation of the other; "`male' and `female' are complementary terms")
complemental, complementary, completing -- (acting as or providing a complement (something that completes the whole))