grand·ma (gr?nd?mä?, gr?n?-, gr?m?mä?, gr?m??)n. Informal A grandmother.American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.grandma (??ræn?m??; ??rænd-; ??ræm-) , grandmama or grandmamman informal words for grandmotherCollins English Dictionary ? Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014grand?moth?er (?græn?m?ð ?r, ?grænd-, ?græm-) n. 1. the mother of one’s father or mother. 2. a female ancestor. [1375?1425] grand?moth`er?ly, adj. grand?moth`er?li?ness, n. Random House Kernerman Webster’s College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.GrandmaA term often applied to the lowest gear on a farm truck when the truck had a four-speed transmission. The name presumably arose because the very slow speed of the truck was likened to that of a grandmother1001 Words and Phrases You Never Knew You Didn?t Know by W.R. Runyan Copyright © 2011 by W.R. Runyan