The Collaborative International Dictionary of English v.0.48:

Mahonia \Mahonia\ prop. n.
   A genus of evergreen shrubs and small trees of North and
   Central America and Asia.
   [WordNet 1.5]

The Collaborative International Dictionary of English v.0.48:

mahonia \ma*ho"ni*a\, n. [Named after Bernard McMahon.] (Bot.)
   The Oregon grape, a species of barberry (Berberis
   Aquifolium), often cultivated for its hollylike foliage.
   [1913 Webster]

WordNet (r) 3.0 (2006):

Mahonia
    n 1: evergreen shrubs and small trees of North and Central
         America and Asia [syn: Mahonia, genus Mahonia]