From BiblePortal Wikipedia

Holman Bible Dictionary [1]

abne-puk   1 Chronicles 29:2 Isaiah 54:11 abne-puk   2 Kings 9:30 Jeremiah 4:30 Job 42:14

Webster's Dictionary [2]

(n.) An elementary substance, resembling a metal in its appearance and physical properties, but in its chemical relations belonging to the class of nonmetallic substances. Atomic weight, 120. Symbol, Sb.

Hastings' Dictionary of the Bible [3]

Antimony .   Isaiah 54:11 RVm [Note: Revised Version margin.] . See Eye.

The Nuttall Encyclopedia [4]

A brittle white metal, of value both in the arts and medicine.