Noun
Certain sacred objects (whose precise form and nature is unknown) that were worn on the breastplate of the Jewish high priest, as described in the Bible, and used in divination or casting lots. [from 16th c.]
(Mormonism) A set of seer stones, bound by silver bows into a set of spectacles, that founder Joseph Smith, Jr. said he found on the hill Cumorah and used to interpret the golden plates.
Source: en.wiktionary.orgAaron and his successors as high priest were given control over the Urim and Thummim by which the will of God could be determined (Exodus 28:30). Source: Internet
However, some would claim that divination is indeed practiced in the Bible, such as in Exodus 28, when the Urim and Thummim are mentioned. Source: Internet