Jǔruò guǒdòng shì yòng jǔruò kuàijīng zuòchéng de.
Konjac jelly is made from the corm of the jǔ-ruò plant.
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history
Not used alone in modern Chinese. Classically it meant the soft young shoot of the cattail rush; today it survives in 蒟蒻, the plant whose corm yields the konjac jelly sold as a snack.
register
Archaic on its own — found in classical botany and the fixed compound only, not in everyday speech.