piwi

Etymology
Short for P-element induced wimpy testis in Drosophila.

Noun

 * 1)  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.
 * 2) a small Australian magpie lark, also known as a Murray magpie.
 * 1) a small Australian magpie lark, also known as a Murray magpie.

Noun

 * 1) pewee