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  1  definition  found 
  From  Webster's  Revised  Unabridged  Dictionary  (1913)  [web1913]: 
  Jalap  \Jal"ap\,  n.  [F.,  fr  Sp  jalapa;  --  so  called  from 
  Jalapa,  a  town  in  Mexico,  whence  it  was  first  obtained.] 
  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.