The Collaborative International Dictionary
Grugru worm
Grugru worm \Gru"gru worm"\ (Zo["o]l.) The larva or grub of a large South American beetle ( Calandra palmarum), which lives in the pith of palm trees and sugar cane. It is eaten by the natives, and esteemed a delicacy.
Wiktionary
grugru worm
n. The larva or grub of a large South American beetle, (taxlink Calandra palmarum species noshow=1), found on the grugru palm.