Definition of water dropwort
1
: a plant of the genus Oenanthe;
especially
: a European poisonous herb (O. crocata) having tuberous roots, a yellow juice that stains the skin, yellow flowers, and foliage resembling that of celery — compare water fennel
2
: a leafless herb (Oxypolis canbyi) of the southeastern U.S. with hollow leaflike stems and slender compound umbels of tiny white flowers
