[1] : The Collaborative International Dictionary of English v.0.48

hellebore \hel"lebore\, n. l. helleborus, elleborus, gr. ?, ?;
   cf. f. hell'ebore, ell'ebore.
   1913 webster
   1. bot. a genus of perennial herbs helleborus of the
      crowfoot family, mostly having powerfully cathartic and
      even poisonous qualities. helleborus niger is the
      european black hellebore, or christmas rose, blossoming in
      winter or earliest spring. helleborus officinalis was
      the officinal hellebore of the ancients.
      1913 webster

   2. bot. any plant of several species of the poisonous
      liliaceous genus veratrum, especially veratrum album
      and veratrum viride, both called white hellebore.
      1913 webster
see also:
helleborus helleborus niger helleborus officinalis veratrum veratrum album veratrum viride 
white hellebore 

[2] : WordNet (r) 2.0

hellebore
     n 1: perennial herbs of the lily family having thick toxic
          rhizomes syn: false hellebore
     2: any plant of the eurasian genus helleborus
see also:
false hellebore 

Hellebore >> H Words
Hellebore, definition of term: Hellebore
hellebore_pag1.html