The Collaborative International Dictionary of English v.0.48:
Pachycephala \Pachycephala\ prop. n. A genus of arborial insectivorous birds. Syn: genus Pachycephala. [WordNet 1.5]WordNet (r) 3.0 (2006):
Pachycephala n 1: arboreal insectivorous birds [syn: Pachycephala, genus Pachycephala]