From WordNet (r) 2.0 (August 2003) [wn]:
Acer
n : type genus of the Aceraceae; trees or shrubs having winged
fruit [syn: Acer, genus Acer]
From The Collaborative International Dictionary of English v.0.48 [gcide]:
Acer \Acer\ n.
1. 1 type genus of the Aceraceae; trees or shrubs having
winged fruit.
Syn: genus Acer
[WordNet 1.5]