Source : Webster's Revised Unabridged Dictionary (1913)

Yucca borer \Yuc"ca bor`er\
   (a) A California boring weevil ({Yuccaborus frontalis}).
   (b) A large mothlike butterfly ({Megathymus yucc[ae]}) of the
       family {Megatimid[ae]}, whose larva bores in yucca roots.