- deafness (n.)
[deafness 词源字典]
- late 14c., from deaf + -ness.[deafness etymology, deafness origin, 英语词源]
- hafnium (n.)
- rare element, 1923, Modern Latin, from Hafnia, Medieval Latin form of Danish Havn "harbor," the usual pre-1400 name of Copenhagen, Denmark, where the element was discovered by physicist Dirk Coster (1889-1950) and chemist George de Hevesy (1885-1966).
- stiffness (n.)
- late 14c., from stiff (adj.) + -ness. Meaning "uneasy formality" is from 1630s.