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jal⋅ap

  [jal-uhp, jah-luhp]
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–noun
1. the dried tuberous root of any of several plants, esp. Exogonium purga, of the morning glory family, or the light yellowish powder derived from it, used in medicine chiefly as a purgative.
2. any of these plants.
Origin:
1665–75; < MF < Sp (purga de) Jalapa purgative from Jalapa

Related forms:
ja⋅lap⋅ic  [ja-lap-ik, jah-] , adjective
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
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jal·ap   (jāl'əp, jä'ləp)   
n.  
  1. A twining eastern Mexican vine (Ipomoea purga syn. I. jalapa) having tuberous roots that are dried, powdered, and used medicinally as a cathartic.
  2. Any of several similar or related plants.
  3. The dried tuberous roots of these plants.

[French, from American Spanish jalapa, short for (purga de) Jalapa, (purgative of) Jalapa, after Jalapa.]
The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2009 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Jalap

Jal"ap\, n. [F., fr. Sp. jalapa; -- so called from Jalapa, a town in Mexico, whence it was first obtained.] (Med.) The tubers of the Mexican plant Ipom[oe]a purga (or Exogonium purga), a climber much like the morning-glory. The abstract, extract, and powder, prepared from the tubers, are well known purgative medicines. Other species of Ipom[oe]a yield several inferior kinds of jalap, as the I. Orizabensis, and I. tuberosa.

False jalap, the root of Mirabilis Jalapa, four-o'clock, or marvel of Peru.
Webster's Revised Unabridged Dictionary, © 1996, 1998 MICRA, Inc.
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Main Entry: jal·ap
Pronunciation: 'jal-&p, 'jäl-
Function: noun
1 a : the dried tuberous root of a Mexican plant of the genusIpomoea (I. purga); also : a powdered purgative drug prepared from this root that contains resinous glycosides b : the root or derived drug of plantsrelated to the one supplying jalap —see TAMPICO JALAP
2 : a plant yielding jalap
Merriam-Webster's Medical Dictionary, © 2002 Merriam-Webster, Inc.
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