The Collaborative International Dictionary
Pluri-
Pluri- \Plu"ri-\ [See Plus.] A combining form from L. plus, pluris, more, many; as pluriliteral.
Douglas Harper's Etymology Dictionary
pluri-
word-forming element meaning "more than one, several, many," from Latin pluri-, from stem of plus (genitive pluris); see plus.
Wiktionary
pluri-
pre. several