Easton's Bible Dictionary Buckthorn, 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." On this account the Canaanites called it "Abel-mizraim" (Genesis 50:10, 11). It was probably near Hebron. The word is rendered "bramble" in Judges 9:14, 15, and "thorns" in Psalm 58:9. Int. Standard Bible Encyclopedia ATAD a'-tad ('aTadh, "a thorn"). See ABEL-MIZRAIM.

Multi-Version Concordance Atad (2 Occurrences) Genesis 50:10 They came to the threshing floor of Atad, which is beyond the Jordan, and there they lamented with a very great and sore lamentation. He mourned for his father seven days. (WEB KJV JPS ASV BBE DBY WBS YLT NAS RSV NIV) Genesis 50:11 When the inhabitants of the land, the Canaanites, saw the mourning in the floor of Atad, they said, "This is a grievous mourning by the Egyptians." Therefore, its name was called Abel Mizraim, which is beyond the Jordan. (WEB KJV JPS ASV BBE DBY WBS YLT NAS RSV NIV)