cloth made of black goats' hair, coarse, rough, and thick, used for sacks, and also worn by mourners ( Genesis 37:34 ; 42:25 ; 2 Sam. 3:31 ; Esther 4:1 Esther 4:2 ; Psalms 30:11 , etc.), and as a sign of repentance ( Matthew 11:21 ). It was put upon animals by the people of Nineveh ( Jonah 3:8 ).

These dictionary topics are from
M.G. Easton M.A., D.D., Illustrated Bible Dictionary, Third Edition,
published by Thomas Nelson, 1897. Public Domain, copy freely.