Medical Dictionary
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
[kom-pluh-men-tuh-ree, -tree] 
adjective, noun, plural -ries.
pləˈmɛn