piwi

noun2

1. •
   [before a noun] A class of genes originally identified as encoding regulatory proteins responsible for maintaining incomplete differentiation in stem cells and maintaining the stability of cell division rates in germline cells.

   • However, piwi and tudor-domain containing genes are absent from flukes and tapeworms and no true vasa orthologue has been identified in schistosomes. — 2015
2. •
   a small Australian magpie lark, also known as a Murray magpie.