from the GNU version of the Collaborative International Dictionary of English
- n. A part or decoration of the breastplate of the high priest among the ancient Jews, by which Jehovah revealed his will on certain occasions. Its nature has been the subject of conflicting conjectures.
from The Century Dictionary and Cyclopedia
- Certain objects mentioned in the Old Testament, with the thummim (Ex. xxviii. 30, etc.) or alone (Num. xxvii. 21; 1 Sam. xxviii. 6), as connected with the rational, or breastplate of the Jewish high priest, and with oracular responses given by him.
Sorry, no etymologies found.