POLYGENIC
polygenic
(adjective) of or relating to an inheritable character that is controlled by several genes at once; of or related to or determined by polygenes
Source: WordNet® 3.1
Etymology
Adjective
polygenic (not comparable)
(genetics) controlled by the interaction of more than one gene
(mathematics, of a function) having an infinite number of derivatives at a point (otherwise it is monogenic)
Source: Wiktionary
Pol`y*gen"ic, a. (Biol.)
Definition: Of or relating to polygeny; polygenetic.
Source: Webster’s Unabridged Dictionary 1913 Edition