a holder for x-ray film with a projecting fin that is held between the teeth so as to show the crowns of the upper and lower teeth in one picture.
Origin of bitewing
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
A dental x-ray film having a central projection on which the teeth can close, holding it in position for the radiographic imagery of several upper and lower teeth simultaneously.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.