n 1  cap  :  a widely distributed genus of composite herbs having flower heads resembling asters but with fewer and narrower involucral bracts  2 a  :  any plant of the genus Erigeron  b  :  the leaves and tops of plants of the genus Erigeron occas. and esp. formerly used as a diuretic and as a hemostatic in uterine hemorrhage  c  :  ERIGERON OIL .
 
   
 
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