dethatcher

Etymology

dethatch + -er

noun

1. A device for dethatching, similar to a lawnmower but with vertical rotating blades.
   You can also rent a power dethatcher from a tool rental company. Have them teach you how to start and run the dethatcher; most are operated much like a lawn mower. 1987, Lawn & garden, page 87
   The dethatcher has blades that cut perpendicular to the lawn, thereby removing the dead debris called thatch, which can easily build up in a lawn. 1988, Stefan Buczacki, Conran's basic book of home gardening
   While you can remove thatch from small areas with a metal garden rake or hand cultivator, you ought to rent a dethatcher for working over large areas of grass. 1998, Landscape Projects