Culver's root

the root of a tall plant, Veronicastrum virginicum, of the figwort family, having spikelike clusters of small, white, tubular flowers, used in medicine as a cathartic and emetic.
the plant.

1710–20, Americanism; named after Dr. Culver, 17th–18th-century American physician Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
Culver's root or Culver's physic (ˈkʌlvəz)
1.  a tall North American scrophulariaceous plant, Veronicastrum virginicum, having spikes of small white or purple flowers
2.  the dried roots of this plant, formerly used as a cathartic and emetic
[C19: named after a Dr Culver, 18th-century American physician]
Culver's physic or Culver's physic
[C19: named after a Dr Culver, 18th-century American physician]

Collins English Dictionary - Complete & Unabridged 10th Edition
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