American Tract Society Bible Dictionary
The wife of Abraham, after the death of Sarah, Genesis 25:1-6 . Though she is called a "concubine," this may have been to distinguish her sons as well as Ishmael from Isaac the son of promise, Genesis 25:6; 1 Chronicles 1:32; Galatians 4:22,30 . Her sons were the ancestors of many Arabian tribes.
These files are public domain and are a derivative of the topics are from American Tract Society Bible Dictionary published in 1859.
Rand, W. W. Entry for 'Keturah'. American Tract Society Bible Dictionary. https://www.studylight.org/dictionaries/eng/ats/k/keturah.html. 1859.