1855 Sept. 241/2 Garrett's newly-invented root pulper (highly commended) is a very efficient machine.
1907 T. Shaw xvi. 359 Pulping roots means putting them through a machine, known as a root pulper. It is run by hand or other power as desired.
2004 S. Campbell ii. 102 We had a root pulper to smash them up, but some of the cows liked them whole and they'd just scoop those mangels out.