井 せい Meanings Noun well curb See also: 井桁 (いげた). Chinese "Well" constellation (one of the 28 mansions) See also: 二十八宿 (にじゅうはっしゅく). See also: 朱雀 (すざく). Kanji 井 well. Read as セイ. Words containing 井 油井 (ゆせい) oil well 市井 (しせい) the street 三井生命保険 (みついせいめいほけん) Mitsui Life Insurance And 24 more. Jinuma: Japanese Dictionary · Word lists