密

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dense; close; thick; intimate; close; (bound form) secret; confidential; (Internet slang) to send a private message to (sb); to DM

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Formation & memory

Break the character into parts you already know.

Ideographic compound (会意字)

A silent 宓 mountain 山; 宓 also provides the pronunciation

Components 宓山

secret · Heisig RSH #692

house + 必 certainly + 山 mountain

Keyword method from Heisig's Remembering Simplified Hanzi.

The most common words first — learning a character in context makes it stick.

Word	Pinyin	Meaning
密山市	Mì shān Shì	Mishan, a county-level city in Jixi City 雞西市\|鸡西市[Ji1 xi1 Shi4], Heilongjiang
密不可分	mì bù kě fēn	inextricably linked (idiom); inseparable
密克罗尼西亚	Mì kè luó ní xī yà	Micronesia
机密性	jī mì xìng	confidentiality
高密市	Gāo mì Shì	Gaomi, a county-level city in Weifang City 濰坊市\|潍坊市[Wei2 fang1 Shi4], Shandong
新密市	Xīn mì Shì	Xinmi, a county-level city in Zhengzhou City 鄭州市\|郑州市[Zheng4 zhou1 Shi4], Henan
人口密度	rén kǒu mì dù	population density
密西西比河	Mì xī xī bǐ Hé	Mississippi River
密西西比	Mì xī xī bǐ	Mississippi
点对点加密	diǎn duì diǎn jiā mì	(Tw) end-to-end encryption
密县	Mì xiàn	Mi county in Henan
密山	Mì shān	see 密山市[Mi4 shan1 Shi4]
人口密集	rén kǒu mì jí	densely populated
通关密语	tōng guān mì yǔ	password
东密德兰	Dōng mì dé lán	East Midlands, English county
密斯	Mì sī	Miss (loanword)
斯密	Sī mì	Smith (name); also rendered as 史密斯
机密	jī mì	secret; classified; classified information; secret
波密县	Bō mì Xiàn	Bomê, a county in Nyingchi City 林芝市[Lin2 zhi1 Shi4], Tibet
密会	mì huì	secret meeting; to meet secretly

These characters use 密 as their sound component — compare how they read.

Character	Pinyin	Meaning
密 sound part	mì	secret, confidential; intimate, close; dense, thick
嘧	mì	in chemistry, -mi as in pyramidine