tenulin
noun
ten·u·lin
ˈtenyələ̇n
plural -s
: a crystalline sesquiterpenoid lactone C17H22O5 obtained from plants of the genus Helenium (as H. tenuifolium)
Word History
Etymology
New Latin tenuifolium (specific epithet of Helenium tenuifolium) (from Latin tenuis thin + folium leaf) + -lin (as in helenalin)