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]WordNet (r) 3.0 (2006):
lobule n 1: a small lobe or subdivision of a lobe