Source : Webster's Revised Unabridged Dictionary (1913)

Lobule \Lob"ule\, n. [Cf. F. lobule, dim. of lobe. See {Lobe}.]
   A small lobe; a subdivision of a lobe.

   {Lobule of the ear}. (Anat.) Same as {Lobe of the ear}.

Source : WordNet®

lobule
     n : a small lobe or subdivision of a lobe