人中

《南村輟耕錄》 explains the origin of the term as follows:

若曰人身之中半，則當在臍腹間。蓋自此而上，眼耳鼻皆雙竅；自此而下，口暨二便皆單竅。三畫陰，三畫陽，成泰卦也。 [Classical Chinese, trad.]

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若曰人身之中半，则当在脐腹间。盖自此而上，眼耳鼻皆双窍；自此而下，口暨二便皆单窍。三画阴，三画阳，成泰卦也。 [Classical Chinese, simp.]

Ruò yuē rénshēn zhī zhōngbàn, zé dāng zài qí fù jiān. Gài zì cǐ ér shàng, yǎn ěr bí jiē shuāng qiào; zì cǐ ér xià, kǒu jì èrbiàn jiē dān qiào. Sān huà yīn, sān huà yáng, chéng tài guà yě. [Pinyin]

If one refers to the middle of the body, it must be around the navel and the abdomen. For going up from here [the philtrum], the eyes, ears, and nose all have two orifices; going down from here, the mouth and the two [organs of] excretion all have single orifices. Three strokes of yin and three strokes of yang make the Peace hexagram.

人中

1. (anatomy, physiology) philtrum

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(This etymology is missing or incomplete. Please add to it, or discuss it at the Etymology scriptorium.)

• (Tokyo) ひとなか [hìtónáká] (Heiban – [0])
• IPA^(key): [çito̞na̠ka̠]

人(ひと)中(なか) • (hitonaka) 

1. society, company
2. the public, the world

(This etymology is missing or incomplete. Please add to it, or discuss it at the Etymology scriptorium.)

• (Tokyo) じ​んちゅう [jíꜜǹchùù] (Atamadaka – [1])
• (Tokyo) じんちゅう [jìńchúú] (Heiban – [0])
• IPA^(key): [d͡ʑĩɲ̟t͡ɕɨᵝː]

人(じん)中(ちゅう) • (jinchū) 

1. in company, among people
2. (anatomy, physiology) philtrum

(This etymology is missing or incomplete. Please add to it, or discuss it at the Etymology scriptorium.)

• (Tokyo) に​んちゅう [níꜜǹchùù] (Atamadaka – [1])
• (Tokyo) にんちゅう [nìńchúú] (Heiban – [0])
• IPA^(key): [ɲ̟ĩɲ̟t͡ɕɨᵝː]

人(にん)中(ちゅう) • (ninchū) 

1. the human world

人中 • (injung) (hangeul 인중)

1. Hanja form^? of 인중 (“philtrum”).

人中

1. chữ Hán form of nhân trung (“philtrum”).