jalapEnglishOxford New American Dictionaryjalap /ˈjäləp, ˈdʒɑləp / ▸ noun a purgative drug obtained chiefly from the tuberous roots of a Mexican climbing plant. This drug is obtained from Ipomoea purga, family Convolvulaceae. – ORIGIN mid 17th century : from French, from Spanish (purga de) Jalapa (see Jalapa).