In Mandarin Chinese, 黄 (Pinyin: huáng 🔊) is an adjective meaning “yellow”. You must have heard this word as a part of 黄河 (黃河, Huáng Hé 🔊), the Yellow River. 黄 also can mean “pornographic”.
黄 is a simplified form of 黃. According to Wiktionary, 黃 is a phono-semantic compound of phonetic 炗 (guāng) and semantic 田 “field”, yellow (supposedly) being the colour of earth.
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