Any of several techniques for creating three-dimensional images of the internal structure of a solid object by analyzing the propagation of waves of energy, such as x-rays or seismic waves, through the object.
tomo·gram′ (tōmə-grăm′) n.
tomo·graph′ (-grăf′) n.
The American Heritage® Dictionary of the English Language, Fifth Edition copyright ©2020 by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Indo-European & Semitic Roots Appendices
Thousands of entries in the dictionary include etymologies that trace their origins back to reconstructed proto-languages. You can obtain more information about these forms in our online appendices:
The Indo-European appendix covers nearly half of the Indo-European roots that have left their mark on English words. A more complete treatment of Indo-European roots and the English words derived from them is available in our Dictionary of Indo-European Roots.