研けん究きゅう責せき任にん者しゃMeaningsNoun1. principal investigator; PIKanji used研refine究research責responsibility任obligation者someoneComposed of研けん究きゅうresearch; study; investigationNoun責せき任にん者しゃperson in charge (including a supervisory role for other staff); person responsible for ...; responsible party; supervisor; managerNoun