I. In botany, a rough, prickly shell or case. 2. The lobe of the ear. 3. In dentistry, an instrument for polishing the teeth. Drills, dental instruments of spherical, cone-shape, cylindrical; and wheel-forms, for opening and forming cavities. Flexible burs and drills having spring- tempered stems are used lor opening and preparing nerve canals. B. Thimble, in dentistry, an open ring for the middle or index finger, with a socket attached, in which rests the end of the handle of the drill used in excavating a cavity in a tooth, preparatory to filling it.
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