milfoil
Concise Oxford English Dictionary © 2008 Oxford University Press:
milfoil /ˈmɪlfɔɪl/
▶noun
- 1 the common yarrow.
- 2 (also water milfoil) an aquatic plant with whorls of fine submerged leaves and wind-pollinated flowers. [Genus Myriophyllum.]
– origin ME: via OFr. from L. millefolium, from mille ‘thousand’ + folium ‘leaf’.
'milfoil' also found in these Oxford entries:

