U·rim and Thum·mim (yrĭm ən thŭmĭm, rĭm; tmĭm)
Sacred objects carried inside the breastplate of the high priest of ancient Israel and used as oracular media to divine the will of God.
The American Heritage® Dictionary of the English Language, Fifth Edition copyright ©2018 by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
The American Heritage Dictionary Blog
Check out our blog, updated regularly, for new words and revised definitions, interesting images from the 5th edition, discussions of usage, and more.