Definition of cow parsnip
: a tall biennial or perennial herb (genus Heracleum and especially H. sphondylium of Eurasia and H. maximum synonym H. lanatum of North America) of the carrot family that has a hollow stem, thick taproot, and large clusters of usually white-flowered umbels — see also giant cow parsnip
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Merriam-Webster unabridged
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Time Traveler for cow parsnip
The first known use of cow parsnip was in 1548
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