The Collaborative International Dictionary of English v.0.48:

Lobule \Lob"ule\, n. [Cf. F. lobule, dim. of lobe. See Lobe.]
   A small lobe; a subdivision of a lobe.
   [1913 Webster]

   Lobule of the ear. (Anat.) Same as Lobe of the ear.
      [1913 Webster]