The Collaborative International Dictionary of English v.0.48:

Glomerule \Glom"er*ule\, n. [Dim. fr. L. glomus ball.]
   [1913 Webster]
   1. (Bot.) A head or dense cluster of flowers, formed by
      condensation of a cyme, as in the flowering dogwood.
      [1913 Webster]

   2. (Anat.) A glomerulus.
      [1913 Webster]

WordNet (r) 3.0 (2006):

glomerule
    n 1: a compacted or sessile cyme