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1. a grandmother ...c1000 obs. exc. Eng. dial.
2. a mother-in-law; a stepmother ...c1440 obs. exc. Eng. dial.
Old English (West Saxon) ealdmódor, from eald, eld a., old + mother
From: Cursor Mundi (The Cursor O The World)
A Northumbrian Poem of the XIVth Century
Edited by the Rev. Richard Morris, Vol. I, 1874, 1893