prop. 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. [ 1913 Webster ]

pos>n. [ See Lieberkuehn. ] (Anat.) The simple tubular glands of the small intestines; -- called also crypts of Lieberkuehn. [ 1913 Webster ]