Definition of "cephalometer" [ceph•a•lom•e•ter]

• A device for measuring the head. (noun)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• "He wore a hat measuring six and seven eighths on the cephalometer used by hatters, which is equivalent to twenty-one inches and a quarter of circumference."
• "_cephalometer_ used by hatters, which is equivalent to twenty-one inches and a quarter of circumference."