From The Collaborative International Dictionary of English v.0.48 :
Acrocephalus \Acrocephalus\ n.
1. 1 a genus of birds.
Syn: genus Acrocephalus.
[WordNet 1.5]
From WordNet (r) 3.0 (2006) :
Acrocephalus
n 1: a genus of Sylviidae [syn: Acrocephalus, genus
Acrocephalus]