milfoil
/ˈmɪlfɔɪl
/noun
1The common Eurasian yarrow.Then, gardens in England were enriched with many species not previously known, among them plants which soon became very popular, like several campanulas, carnations, and milfoils.
2 (also water milfoil) A widely distributed aquatic plant with whorls of fine submerged leaves and wind-pollinated flowers.
- Genus Myriophyllum, family Haloragaceae.
- The common kinds include the large family of pondweeds, coontail, water milfoil, water weeds, and naiads (Najas).
- In half of the sites studied, algae, mosses and plants such as water milfoil that had previously been absent were becoming abundant.
Origin
Middle English: via Old French from Latin millefolium, from mille 'thousand' + folium 'leaf'.