Vocabulary What does 硫黄 (いおう, iou) mean? 硫黄 (いおう, iou) means sulfur (S); sulphur. Quick factsReadingいおうRomajiiouPart of speechnoun 硫黄いおうiousulfur (S); sulphur1noun sulfur (S); sulphurKanji in this word硫sulfur黄yellow
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