pir·i·piri \ˌpirəˈpirē\noun (-s) Etymology: Maori 1. a.: a troublesome New Zealand weed (Acaena sanguisorbae) bearing burs covered with hooked bristles b.: white mapau 2.alsopirijiri: a fragrant Asiatic and Australasian herb (Haloragis micrantha) of the family Haloragidaceae