Noah Webster's Dictionary (n.) The mother of one's father or mother.

Multi-Version Concordance Grandmother (3 Occurrences) 2 Timothy 1:5 having been reminded of the unfeigned faith that is in you; which lived first in your grandmother Lois, and your mother Eunice, and, I am persuaded, in you also. (WEB KJV WEY ASV DBY WBS YLT NAS RSV NIV) 1 Kings 15:13 Also Maacah his mother he removed from being queen, because she had made an abominable image for an Asherah; and Asa cut down her image, and burnt it at the brook Kidron. (See NIV) 2 Chronicles 15:16 Also Maacah, the mother of Asa the king, he removed from being queen, because she had made an abominable image for an Asherah; and Asa cut down her image, and made dust of it, and burnt it at the brook Kidron. (See NIV)