From The Collaborative International Dictionary of English v.0.48 :
Lilium \Lilium\ n.
The type genus of the Liliaceae.
Syn: genus Lilium.
[WordNet 1.5]
From WordNet (r) 3.0 (2006) :
Lilium
n 1: type genus of Liliaceae [syn: Lilium, genus Lilium]