Main Entry: his·to·gen·e·sis Pronunciation: "his-t&-'jen-&-s&s Function: noun Inflected Form: pluralhis·to·gen·e·ses/-"sEz/ : the formation and differentiation of tissues —his·to·ge·net·ic/-j&-'net-ik/adjective —his·to·ge·net·i·cal·ly/-i-k(&-)lE/adverb