[ plān ]
An x-ray taken without the use of a contrast medium.
These Plain Words Have Very Odd Origin StoriesOver the years, these words have gone on a journey from signifying creepy, strange, antithetical, and even paranormal ideas to taking on the standard meanings we know and understand today.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.