The Collaborative International Dictionary of English v.0.48:
Amentiferae \Amentiferae\ prop. n. 1. used in some classification systems for plants that bear catkins. Syn: group Amentiferae [WordNet 1.5]WordNet (r) 3.0 (2006):
Amentiferae n 1: used in some classification systems for plants that bear catkins [syn: Amentiferae, group Amentiferae]