膨润土 Traditional 膨潤土 péng rùn tǔ 🔊 bentonite (mineralogy) + Keep this word Meanings péng rùn tǔ 膨潤土 bentonite (mineralogy) Its characters 膨péngswollen润rùnmoist; glossy; sleekHSK 7–9土tǔearthHSK 4