parietal bone

noun Anatomy.
either of a pair of membrane bones forming, by their union at the sagittal suture, part of the sides and top of the skull.

Origin:
1695–1705

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Collins
World English Dictionary
parietal bone
 
n
either of the two bones forming part of the roof and sides of the skull

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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American Heritage
Medical Dictionary

parietal bone n.
Either of two irregularly quadrilateral bones between the frontal and occipital bones that together form the sides and top of the skull.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Encyclopedia Britannica
Encyclopedia

parietal bone

cranial bone forming part of the side and top of the head. In front each parietal bone adjoins the frontal bone; in back, the occipital bone; and below, the temporal and sphenoid bones. The parietal bones are marked internally by meningeal blood vessels and externally by the temporal muscles. They meet at the top of the head (sagittal suture) and form a roof for the cranium. The parietal bone forms in membrane (i.e., without a cartilaginous precursor); the sagittal suture closes between ages 22 and 31. In primates that have large jaws and well-developed chewing muscles (e.g., gorillas and baboons), the parietal bones may be continued upward at the midline to form a sagittal crest. Among early hominids, Paranthropus (also called Australopithecus robustus) sometimes exhibited a sagittal crest.

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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Example sentences
The thing that really caught my eye was this piece of the frill-the parietal bone.
Near the center of the parietal bone is the parietal eminence.
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