The Collaborative International Dictionary of English v.0.48:
nonhereditary \nonhereditary\ adj. Not inheritable through genetic transmission. Opposite of inheritable, and heritable. [Narrower terms: acquired, nurtural; congenital, inborn, innate ] Syn: nontransmissible, nonheritable, noninheritable. [WordNet 1.5] nonhierarchicWordNet (r) 3.0 (2006):
nonhereditary adj 1: not acquirable by inheritance [syn: {nonhereditary, nontransmissible]