[rey-dee-oh-loo-suh nt]
  1. almost entirely transparent to radiation; almost entirely invisible in x-ray photographs and under fluoroscopy.

Origin of radiolucent

First recorded in 1915–20; radio- + lucent
Related formsra·di·o·lu·cence, ra·di·o·lu·cen·cy, noun Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Examples from the Web for radiolucent

Historical Examples of radiolucent

  • The creature must be largely transparent to visible light, as human flesh is radiolucent to hard X-rays.

    Salvage in Space

    John Stewart Williamson

British Dictionary definitions for radiolucent


  1. almost transparent to electromagnetic radiation, esp X-rays
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

radiolucent in Medicine


  1. Characterized by allowing passage of x-rays or other radiation; not radiopaque.
Related formsra′di•o•lucen•cy n.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.