from The American Heritage® Dictionary of the English Language, 4th Edition
- n. A device for measuring the penetrating power of radiation, especially x-rays.
- n. A device for measuring the penetrability of semisolids.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. A mechanical device that measures the ease of penetration of an object into a semisolid.
- n. A device that measures the penetrating power of electromagnetic radiation (especially X-rays).
Sorry, no etymologies found.