complementary

com·ple·men·ta·ry   (kŏm'plə-měn'tə-rē, -trē)    adj.   Forming or serving as a complement; completing. Supplying mutual needs or offsetting mutual lacks. Genetics Of or relating to a group of genes that act in concert to produce a specific phenotype. Biochemistry Of or relating to the specific pairing of the purines and pyrimidines between strands of a DNA or an RNA molecule. com'ple·men'ta·ri·ly (-tə-rə-lē, -trə-lē, -měn-târ'ə-lē) adv., com'ple·men'ta·ri·ness n.

Main Entry: com·ple·men·ta·ry
Pronunciation: "käm-pl&-'ment-&-rE, -'men-trE
Function: adjective
1 : relatingto or constituting one of a pair of contrasting colors that produce a neutral color when combined in suitable proportions
2 : characterized by molecular complementarity;especially : characterized by the capacity for precise pairing of purine and pyrimidine bases between strands of DNA and sometimes RNA such that the structure of one strand determinesthe other —com·ple·men·ta·ri·ly /-'men-tr&-lE, -(")men-'ter-&-lE, -'ment-&-r&-lE/ adverb —com·ple·men·ta·ri·ness /-'ment-&-rE-n&s, -'men-trE-/ noun