American Heritage Dictionary of the English Language, 5th Edition
From the name of Mount Monadnock in New England, which derives from an Abenaki word, perhaps menonadenak, menonadenek (“smooth mountain") or menadenak, menadenek (“isolated mountain"), from aden (“mountain").
Monadnock Sentence Examples
"It's obvious he's not going to address the issue," Betsy grumbled as we spent our Saturday climbing nearby Mount Monadnock.
Monadnock (in New Hampshire, nearN.E.Massachusetts), the Blue Hills near Boston, Greylock, in the north-west, and Wachusett in the centre, are the most commanding remnant-summits (known generically as " Monadnocks ") of the original mountain system.
Extending from Mount Monadnock in Cheshire, the S.W.
The type of this class of forms is Mt Monadnock in south-western New Hampshire, a fine example of an isolated residual mass rising from an upland some 1500 ft.