Strong's #8550: Tummiym (pronounced toom-meem')

plural of 8537; perfections, i.e. (techn.) one of the epithets of the objects in the high-priest's breastplate as an emblem of complete Truth:--Thummim.

Brown-Driver-Briggs Hebrew Lexicon:

ּּ

tûmmı̂ym

Thummim = "perfection"

1) stones provided for the means of achieving a sacred lot

1a) used with the Urim, the will of God was revealed

Part of Speech: noun proper masculine

Relation: plural of H8537

Usage:

This word is used 5 times:

 

Exodus 28:30: "of judgment the Urim and the Thummim; and they shall be upon Aaron's heart,"
Leviticus 8:8: "the breastplate the Urim and the Thummim."
Deuteronomy 33:8: "And of Levi he said, Let thy Thummim and thy Urim be with thy holy one, whom thou didst prove"
Ezra 2:63: "of the most holy things, till there stood up a priest with Urim and with Thummim."
Nehemiah 7:65: "of the most holy things, till there stood up a priest with Urim and Thummim."