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TAKE THE QUIZ“horizontal plane”
We have one entry that includes the term horizontal plane.
Frankfort horizontal plane
noun: a plane used in craniometry that is determined the highest point on the upper margin of the opening of each external auditory canal and the low point on the lower margin of the left orbit and that is used to orient a human skull or head usually so that the plane is horizontal
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Merriam-Webster unabridged