A dowager was a woman of high social rank whose husband was dead but who had a title (such as duchess) and property because of her marriage to him.
Dowager hump, or dowager's hump, is formally known in medicine as postmenopausal cervical kyphosis. It is due to osteoporotic changes in the cervical spine. It may affect men or women. Like most osteoporotic changes, it is often preventable.