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The Collaborative International Dictionary of English v.0.48:

Thickhead \Thick"head`\, n. 1. A thick-headed or stupid person. [Colloq.] [1913 Webster] 2. (Zool.) Any one of several species of Australian singing birds of the genus Pachycephala. The males of some of the species are bright-colored. Some of the species are popularly called thrushes. [1913 Webster]