uncapping-knife

from The Century Dictionary.

• noun In beekeeping, a knife with a broad, double-edged blade secured by an offset to a wooden handle: used to slice off the covers or caps of the honeycomb preparatory to extracting the honey. In using the knife, the honeycomb, in its frame, is held over an enameled vessel called an uncapping-can, the wax or cappings falling on a wire screen, and the honey passing through the screen into a second vessel below.