lanugo Syllabification: (la·nu·go)Pronunciation: /ləˈn(y)o͞ogō/Definition of lanugo noun Anatomy fine, soft hair, especially that which covers the body and limbs of a human fetus or newborn. Origin: late 17th century: from Latin, 'down', from lana 'wool'lanugo in other Oxford dictionaries Definition of lanugo in the British & World English dictionary