com·plain·ant
noun/kəmˈpleɪnənt/
/kəmˈpleɪnənt/
(also more frequent plaintiff)
(law)- a person who makes a formal complaint against somebody in court
原告；起诉人 Word Originlate Middle English: from French complaignant, present participle of complaindre ‘to lament’, from medieval Latin complangere ‘bewail’, from Latin com- (expressing intensive force) + plangere ‘to lament’.