Idumaea is the Greek form of Edom, the region and people descended from Esau.
Definition
Idumaea is the Greek form of Edom. It denotes the land or people associated with Edom.
Biblical Usage
The term occurs in Greek form in passages referring to Edom; in the Revised Version it is rendered “Edom.”
Historical Bible Dictionaries
Easton's Bible Dictionary
The Greek form of Edom (Isa. 34:5, 6; Ezek. 35:15; 36:5, but in R.V. “Edom”). (See EDOM).