nu·cle·o·pro·tein
| \ ˌnü-klē-ō-ˈprō-ˌtēn
, ˌnyü-, -ˈprō-tē-ən\
: a compound that consists of a protein (such as a histone) conjugated with a nucleic acid (such as a DNA) and that is the principal constituent of the hereditary material in chromosomes