"plunderer," mid-14c., pilour, from obsolete verb pill "to plunder, to pillage" (see pillage (v.)). Related: Pillery "robbery, plunder" (mid-15c.).
Entries linking to piller
pillage v.
"to plunder, despoil, strip of money or goods by open violence," 1590s, from pillage (n.). Related: Pillaged; pillaging; pillager. The earlier form of the verb in English was simply pill (late Old English pilian), which probably is from Medieval Latin pillare.