人じん孔こうじんこうMeanings1nounmanholeTechnical term used in civil engineering and construction. In everyday conversation, マンホール is far more common.See also: マンホール道どう路ろ工こう事じのため、人じん孔こうの蓋ふたを開あける作さ業ぎょうが行おこなわれた。For road construction, work was done to open the manhole cover.