Definition of milfoil in English:



  • 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.’
  • 2A widely distributed and highly invasive aquatic plant with whorls of fine submerged leaves and wind-pollinated flowers.

    • ‘Totally submerged are bladderwort, coontail, and water milfoil.’
    • ‘A submerged aquatic weed that invades lakes, ponds, and reservoirs, milfoil often restricts natural water flow, clogs water intakes, and eliminates native species from ecosystems.’
    • ‘He rocks the boat under his feet so we bob and toss through the green skim of milfoil.’
    • ‘If the vegetation is primarily milfoil, musk grass, pondweed, or naiad, these stocking rates are recommended.’
    • ‘Lakes and ponds have buttonbush, pickerel weed, bulltongue arrowhead, horned bladderwort, water milfoil, and water-shield growing in the water.’
    • ‘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.’


Middle English: via Old French from Latin millefolium, from mille thousand + folium leaf.