jalap

noun

1. the dried tuberous root of any of several plants, especially 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.

noun

1. a Mexican convolvulaceous plant, Exogonium (or Ipomoea) purga
2. any of several similar or related plants
3. the dried and powdered root of any of these plants, used as a purgative
4. the resin obtained from any of these plants