‘苹草’ (píng cǎo) is a classical Chinese term referring to duckweed — a tiny, free-floating aquatic plant commonly found on still freshwater surfaces like ponds and rice paddies. Though composed of two characters — 苹 (píng), which historically denoted certain aquatic herbs including duckweed, and 草 (cǎo), meaning ‘grass’ or ‘herb’ — the compound functions as a single noun. It appears primarily in pre-modern poetry, agricultural texts, and classical botanical descriptions, evoking images of tranquility, transience, or natural harmony.

In modern standard Mandarin, ‘苹草’ is rarely used in everyday speech or scientific contexts; instead, terms like 浮萍 (fú píng) or 单子叶浮萍 (dān zǐ yè fú píng) are preferred. Nevertheless, it remains valuable for reading classical literature, where its poetic resonance and historical specificity enrich understanding of ecological imagery and traditional nature vocabulary.