pilotweed

[ pahy-luh t-weed ]
/ ˈpaɪ lətˌwid /

noun

the compass plant, Silphium laciniatum.

Origin of pilotweed

An Americanism dating back to 1840–50; pilot + weed1
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019