1) Surgical instrument 
A rongeur is a strongly constructed instrument with a sharp-edged, scoop-shaped tip, used for gouging out bone. Rongeur is a French word that means rodent or `gnawer`. A rongeur can be used to open a window in bone, often in the skull. It is used in neurosurgery and orthopedic surgery to expose areas for operation. A rongeur is also used in oral.....
• (n.) An instrument for removing small rough portions of bone.
(raw-zhur´) a forcepslike instrument for cutting tough tissue, particularly bone.
Ron`geur' noun [ French, from ronger to gnaw.] (Surg.) An instrument for removing small rough portions of bone. 
Type: Term Pronunciation: rawn-zhĕr′ Definitions: 1. A strong, biting forceps for nipping away bone.