遺い残ざん

noun, noun which may take the genitive case particle 'no'

persistence; vestigial remnant

Medical and biological term for something that remains or persists from an earlier stage, especially a vestigial structure or a persistent embryonic remnant.

• 胎たい生せい期きの遺い残ざんが成せい人じんになっても残のこることがある。

  Embryonic remnants can sometimes persist into adulthood.

• この器き官かんは進しん化かの遺い残ざんと考かんがえられている。

  This organ is considered a vestigial remnant of evolution.