noun
Brazilian elodea; Egeria densa
An aquatic plant native to South America, often used in aquariums and known as an invasive species in some regions.
オオカナダモは水槽でよく育てられる水草です。
Brazilian elodea is an aquatic plant often grown in aquariums.
この池ではオオカナダモが異常繁殖している。
Brazilian elodea is overgrowing in this pond.
The name combines 大 (おお, 'large') with カナダ (Canada) and 藻 (も, 'algae/waterweed'), literally 'large Canada waterweed'. The exact origin of the name is uncertain, but it likely refers to the plant's origin or introduction pathway.