Lie″ber‐kühn (lē″bẽr‐kụn), n. [Named after a German physician and instrument maker, J. N. Lieberkühn.] (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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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.