The Collaborative International Dictionary of English v.0.48:

Glomerulus \Glo*mer"u*lus\, n.; pl. Glomeruli. [NL., dim. of
   L. glomus. See 3d Glome.] (Anat.)
   The bunch of looped capillary blood vessels in a Malpighian
   capsule of the kidney.
   [1913 Webster]