あおせん

青線

表記・読み：あおせん

1. 1

   blue line

   名詞
2. 2

   area around a red-light district where illegal prostitution occurred (marked on police maps by a blue line; 1940s-1956)

   名詞historical termabbreviation
3. 3

   non-legal public waterway (denoted by a blue line on cadastral maps; sometimes no longer physically existing)

   名詞