Wa·ter drop·wort Bot. A European poisonous umbelliferous plant (Enanthe fistulosa) with large hollow stems and finely divided leaves.
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  water dropwort
       n : European poisonous herb having tuberous roots, yellow juice
           that stains the skin, yellow flowers and foliage
           resembling celery; all parts extremely poisonous [syn: hemlock
           water dropwort, Oenanthe crocata]