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frontal bone

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noun Anatomy.
  1. a broad membrane bone of the skull, forming the forehead and the upper portion of each orbit.
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Origin of frontal bone

First recorded in 1735–45
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
British Dictionary definitions for frontal bone

frontal bone

noun
  1. the bone forming the forehead and the upper parts of the orbits. It contains several air spaces
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Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
frontal bone in Medicine

frontal bone

n.
  1. A cranial bone consisting of a vertical portion corresponding to the forehead and a horizontal portion that forms the roofs of the orbital and nasal cavities.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.