ˈhiˌstōn noun
( -s )
Etymology: International Scientific Vocabulary hist- + -one
: any of various simple proteins that are soluble in water but insoluble in dilute ammonia, that yield a high proportion of basic amino acids on hydrolysis but are less strongly basic than protamines, and that are found especially in some glandular tissues (as thymus) combined with deoxyribonucleic acid