Webster’s Revised Unabridged Dictionary · 1913
Lucernal
Lu·cer′nal (lū·sẽr′nal), a. [L. lucerna a lamp.] Of or pertaining to a lamp.
Lucernal microscope, a form of the microscope in which the object is illuminated by means of a lamp, and its image is thrown upon a plate of ground glass connected with the instrument, or on a screen independent of it.