milfoil /milˈfoil/

1. Yarrow, or any other species of Achillea
2. Extended to other plants with finely divided leaves, such as water milfoil (genus Myriophyllum, family Haloragidaceae)

• on tow of vehicles
• on-trend
• on trial
• on trust
• onus
• onuses
• onus probandi
• on velvet
• on view
• onward
• onwardly
• onwards
• on wings
• onycha
• onychas
• onychia
• onychias
• onychite
• onychites
• onychitis
• onychitises
• onychium
• onychiums
• onychocryptoses
• onychocryptosis