noun · plants that grow in or on the water

鱼缸里种了一些绿色的水草。

noun · water and grass; land with favorable conditions for grazing livestock or wild animals

这里的牧场水草丰茂，适合放牧。

noun · a tube used for sucking up a beverage (Malaysian colloquial usage)

请给我一支水草来喝果汁。