Pachycephalosauridae

Pachycephalosauridae

[‚pak·ə‚sef·ə·lə′sȯr·ə‚dē]
(paleontology)
A family of ornithischian dinosaurs characterized by a skull with a solid rounded mass of bone 4 inches (10 centimeters) thick above the minute brain cavity.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
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