• WordNet 3.6
    • n cohosh a plant of the genus Actaea having acrid poisonous berries
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Webster's Revised Unabridged Dictionary
    • n Cohosh (Bot) A perennial American herb (Caulophyllum thalictroides), whose rootstock is used in medicine; -- also called pappoose root. The name is sometimes also given to the Cimicifuga racemosa, and to two species of Actæa, plants of the Crowfoot family.
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Century Dictionary and Cyclopedia
    • n cohosh A name in the United States of several plants which have been used medicinally. Cimicifuga racemosa, the black cohosh.
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In literature:

You should be able to design a number of pretty things from the cohosh leaves and berries, too.
"The Harvester" by Gene Stratton Porter
Take horehound herb, elecampane root, spikenard root, ginseng root, black cohosh, and skunk cabbage root, of each a good-sized handful.
"The Ladies Book of Useful Information" by Anonymous
And I found the cohosh coigne the same, Tossing with torches of pearly flame.
"The Garden of Dreams" by Madison J. Cawein
Black cohosh has a heavy odor and a bitter, acrid taste.
"Ginseng and Other Medicinal Plants" by A. R. (Arthur Robert) Harding

In poetry:

By the black-cohosh with its pearly plume
A nod in the woodland's odorous gloom;
By the old rail-fence, in the elder's shade,
That the myriad hosts of the weeds invade:
"The Road Home" by Madison Julius Cawein
Now 'tis the time when ways
Of glimmering green flaunt white the misty plumes
Of the black-cohosh; and through bramble glooms,
A blur of orange rays,
The butterfly-blossoms blaze.
"July" by Madison Julius Cawein