ChristianAnswers.Net WebBible Encyclopedia
Atad was a place where Joseph and his brethren, when on their way from Egypt to Hebron with the remains of their father Jacob, made for seven days a “great and very sore lamentation.”
For this reason, the Canaanites called it “Abel-mizraim” (Genesis 50:10-11). It was probably near Hebron.
The word is rendered “bramble” in Judg. 9:14-15, and “thorns” in Ps. 58:9.