The Collaborative International Dictionary of English v.0.48:

Centaurium \Centaurium\ prop. n.
   A genus of low-growing herbs mostly of the northern
   hemisphere having flowers with protruding spirally twisted
   anthers.

   Syn: genus Centaurium.
        [WordNet 1.5]

WordNet (r) 3.0 (2006):

Centaurium
    n 1: genus of low-growing herbs mostly of northern hemisphere
         having flowers with protruding spirally twisted anthers
         [syn: Centaurium, genus Centaurium]