Noah Webster's Dictionary (n.) A father's or mother's father; an ancestor in the next degree above the father or mother in lineal ascent.

Multi-Version Concordance Grandfather (1 Occurrence) 2 Samuel 9:7 David said to him, "Don't be afraid of him; for I will surely show you kindness for Jonathan your father's sake, and will restore to you all the land of Saul your father. You shall eat bread at my table continually." (See NAS NIV)