• WordNet 3.6
    • n mossback an extremely old-fashioned conservative
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Webster's Revised Unabridged Dictionary
    • n Mossback A veteran partisan; one who is so conservative in opinion that he may be likened to a stone or old tree covered with moss.
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Century Dictionary and Cyclopedia
    • n mossback A large and old fish, as a bass: so called by anglers, in allusion to the growth of seaweed, etc., which may be found on its back.
    • n mossback In United States politics, one attached to antiquated notions; an extreme conservative.
    • n mossback In the southern United States, during the civil war, one who hid himself to avoid conscription.
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In literature:

A fine bunch of whitewater birlers we'd look if we got hung up by an old mossback in a plug hat.
"The Riverman" by Stewart Edward White
I'm going to prove I'm not a mossback.
"Dr. Jonathan (A Play)" by Winston Churchill
We're old mossbacks; and our job is done.
"The Rules of the Game" by Stewart Edward White
You don't know whether you can pass at all, you Yaller Mossback.
"Two Little Savages" by Ernest Thompson Seton
Cousin Martha is completely lovely, and the Mossback gets his beauty from her.
"The Tinder-Box" by Maria Thompson Daviess
Mossbacks are always ready to believe that a man that's travelled any has been raising seventeen kinds of tophet all his life.
"The Skipper and the Skipped" by Holman Day
But the asset side of our "mossback's" yearly balance sheet always made the liability side ashamed of itself.
"Skookum Chuck Fables" by Skookum Chuck (pseud for R.D. Cumming)
He was followed to the very verge of the wood, and then the exhausted "mossback" left him to return to the house.
"A Tramp's Notebook" by Morley Roberts
There is the "old" farmer, there is the "new" farmer, and there is the "mossback.
"Chapters in Rural Progress" by Kenyon L. Butterfield
Two or three miles away was a little clearing where a mossback lived.
"Forest Neighbors" by William Davenport Hulbert