Definitions

from The Century Dictionary.

  • noun An annular reflector attached to the nose of the object-glass of a microscope for bringing the light to a focus on an opaque object.

from the GNU version of the Collaborative International Dictionary of English.

  • noun (Optics) A concave metallic mirror attached to the object-glass end of a microscope, to throw down light on opaque objects; a reflector.

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