frontal bone

American  

noun

Anatomy.

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

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frontal bone British  

noun

1. the bone forming the forehead and the upper parts of the orbits. It contains several air spaces

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Etymology

Origin of frontal bone

First recorded in 1735–45

Example Sentences

That young T. rex is represented by a skull bone -- the frontal bone -- with distinctive features that ally it with Tyrannosaurus, but which aren't seen in Nanotyrannus.

From Science Daily • Jan. 2, 2024

Then in 2017, in an even deeper layer, they discovered a forehead or frontal bone and a piece of shin bone, both identified from their characteristic bone shapes as belonging to our species.

From Science Magazine • Jun. 13, 2023

Based on these techniques, the researchers concluded the human frontal bone and tibia were buried in Tam Pà Ling sometime between 86,000 and 68,000 years ago.

From Science Magazine • Jun. 13, 2023

During early childhood, the mastoid process enlarges, the two halves of the mandible and frontal bone fuse together to form single bones, and the paranasal sinuses enlarge.

From Textbooks • Jun. 19, 2013

Internal temporalis Origin: sagittal crest and skull roof, including posterior two-thirds of frontal bone, whole of parietal, and dorsalmost portions of squamosal and alisphenoid.

From The Adductor Muscles of the Jaw In Some Primitive Reptiles by Fox, Richard C.