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