| Noun | 1. | Ranunculus aquatilis - plant of ponds and slow streams having submerged and floating leaves and white flowers; Europe and North Americagenus Ranunculus, Ranunculus - annual, biennial or perennial herbs: buttercup; crowfoot aquatic plant, hydrophyte, hydrophytic plant, water plant - a plant that grows partly or wholly in water whether rooted in the mud, as a lotus, or floating without anchorage, as the water hyacinth |