遡る[sakanoboru] to go back 遡及[sakkyuu] tracing back 遡源[sakugen] returning to the origin 遡及的[sokyuuteki] retroactive 遡上[sojou] going upstream
遡航[sokou] going upstream 遡求[sokyuu] redemption 遡河魚[sokagyo] anadromous fish (fish that migrates upstream, e.g. salmon) 遡及書誌[sokyuushoshi] retrospective bibliography 遡求権[sokyuuken] right of recourse