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

(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”).