青線区域 あおせんくいき Meanings Noun area around a red-light district where illegal prostitution occurred (marked on police maps by a blue line; 1940s-1956) See also: 青線地帯 (あおせんちたい). Kanji 青 blue. Read as あお. 線 line. Read as セン. 区 district 域 region. Read as イキ. Jinuma: Japanese Dictionary · Word lists