What's the difference between dowager and dowagerism?

Dowager

Definition:

(n.) A widow endowed, or having a jointure; a widow who either enjoys a dower from her deceased husband, or has property of her own brought by her to her husband on marriage, and settled on her after his decease.
(n.) A title given in England to a widow, to distinguish her from the wife of her husband's heir bearing the same name; -- chiefly applied to widows of personages of rank.

Example Sentences:

(1) Titanic's trailer is two minutes 37 seconds of lifeboat-related stampeding intercut with women swishing about in big hats doing seasick Dowager Countess expressions.
(2) A pair of Dutch dowagers try chatting him up from their bar stools, and they have a conversation neither party understands before Smith repairs to his table.
(3) The structure will dwarf nearby buildings, including the Meiji Memorial Picture Gallery, an officially recognised cultural asset built in 1926 to honour the emperor and empress dowager Shoken.
(4) Johnson also appeared to go around dismissing staff with about as much regard as a dowager for a housemaid, though she says this wasn't accurate.
(5) The story of the Grantham family has reached 1924, and, according to Mrs Hughes, “Downton is catching up with the times we live in.” “That is exactly what I’m afraid of,” replies Carson, suggesting yet more resistance to impending modernity – which, of course, means plenty of opportunity for baffled zingers from the Dowager Countess.
(6) But they can still appear as champions of the people The old image of the Establishment was summed up by the cartoons of H.M. Bateman in the Twenties, showing a hapless outsider committing a faux pas at a club or grand reception, faced by spluttering colonels or outraged dowagers.
(7) • Deborah Vivien Cavendish, Dowager Duchess of Devonshire, stately home owner and writer, born 31 March 1920; died 24 September 2014
(8) The plot of Anderson's pink gateau of a movie, with its dowager duchesses, murderers and bakers, turns on the fate of a "priceless" Renaissance portrait of a youth pensively clawing an apple with long, bony fingers.
(9) Deborah, Dowager Duchess of Devonshire, who has died aged 94, was for more than half a century the chatelaine of Chatsworth House , the great stately home and estate in Derbyshire.
(10) The 78-year-old actor who plays the Dowager Countess of Grantham in the ITV drama series said she would find it too frustrating to watch and notice how she could have done things better.
(11) Johnston – whose credits include The Royle Family, Coronation Street and Waking the Dead – will play Denker, lady's maid to Maggie Smith's Dowager Countess of Grantham.
(12) As Latifah oversees the ceremony, Madonna – rocking a cane, a white suit and a cowboy hat – hobbles onto the stage looking like a yoga enthusiast version of the Dowager Countess to sing a few verses of Open Your Heart to Me.
(13) "Julian Fellowes has written another brilliant character in Martha Levinson, who will be a wonderful combatant for Maggie Smith's dowager countess and we are excited at the prospect of Shirley MacLaine playing her."
(14) The spine is frequently involved, so that elderly women with kyphosis due to multiple compression fractures ("dowager's hump") are commonly seen in a geriatric practice.
(15) It's enough to make the Dowager Countess drop her cucumber sandwich.
(16) His new film focuses on a hotel concierge called Monsieur Gustave (Ralph Fiennes) and a bellhop called Zero (newcomer Tony Revolori) who endeavour to recover an inheritance left to Gustave by a wealthy dowager.
(17) Really, we're like the dowager countess of fashion columns.
(18) Daisy [the aspiring assistant cook] is as much a character as Violet [Maggie Smith’s Dowager Countess of Grantham].” Carnival is mining a more distant past for a BBC America-backed drama for BBC2 this autumn, The Last Kingdom, based on the popular Saxon Stories novels by Bernard Cornwell, brought to Neame’s attention two years ago.
(19) Her withering asides and perfectly-timed eye-rolls have long been the highlight of Downton Abbey, but the dowager countess, as played by Maggie Smith, might be about to find herself with some competition.
(20) Then when [the doctor]’s arrived, I’ll hold you down and tear the clothes from your body, if that’s what it takes.” Real talk from the dowager countess When Cousin Isobel feels guilty about feeling jealous at seeing Mary "come alive again": CI: “It's immoral to react in such a jealous and selfish way.” DC: “If we only had moral thoughts, what would the poor churchmen find to do?