n 1 a  :  the dried tuberous root of a Mexican plant of the genus Ipomoea (I. purga); : also  :  a powdered purgative drug prepared from this root that contains resinous glycosides  b  :  the root or derived drug of plants related to the one supplying jalap - see TAMPICO JALAP  2

:  a plant yielding jalap .
 
   
 
Published under license with Merriam-Webster, Incorporated.  © 1997-2024.