Easton's Bible Dictionary (1897)
Incense, the wife of Abraham, whom he married probably after Sarah’s death (Gen. 25:1-6), by whom he had six sons, whom he sent away into the east country. Her nationality is unknown. She is styled “Abraham’s concubine” (1 Chr. 1:32). Through the offshoots of the Keturah line Abraham became the “father of many nations.”
Smith's Bible Dictionary (1863)
(incense), the wife of Abraham after the death of Sarah. (Genesis 25:1; 1 Chronicles 1:32) (B.C. 1860.)
Hastings' Dictionary of the Bible (1898) & Schaff's Bible Dictionary
KETU'RAH (incense), the wife of Abraham after Sarah's death. Gen 25:1; 1 Chr 1:32. She was the mother of six sons.
Hitchcock's Bible Names (1869)
that makes the incense to fume