Source : Webster's Revised Unabridged Dictionary (1913)

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.

Source : WordNet®

glomerulus
     n : a small intertwined group of capillaries in the malpighian
         body; glomeruli filter blood during urine formation
     [also: {glomeruli} (pl)]