遷流 is read as せんる (senru) and means transient.
せんる
senru
せんと
relocation of the capital
せんぐう
installation of a deity in a new shrine
せんいかんすう
transfer function
せんいかくりつ
transition probability
せんいげんそ
transition element
せんしゃだい
traverse table
げきりゅう
raging stream
けいりゅう
mountain stream
だんりゅう
warm current
だくりゅう
muddy stream
げんりゅう
origin of something continuous (language, culture, etc.)
かさいりゅう
pyroclastic flow