eldmother means one's grandmother or other female ancestor, or one's mother-in-law. Lexicurio rates it Rare gem — a strength score of 83 out of 100.
Why “eldmother” is a great word
ELDMOTHER — [Noun] A grandmother, mother-in-law, or other female ancestor, specifically connoting venerable age and lineage. From Middle English *eldmoder*, from Old English *eald mōdor* ("old mother"), equivalent to *eld* ("old") + *mother*. Unlike "grandmother," a term of simple relation, or "matriarch," a title of clan authority, "eldmother" carries the quiet weight of antiquity and formal connection. She is the keeper of a recipe whose origin is forgotten, the hands that remember a lost stitch in a quilt, the silhouette of a shawl-clad figure at a gate in the fading light—the quiet, living root from which the present moment grows.
noun
- One's grandmother or other female ancestor, or one's mother-in-law.“Item I gyve vnto my eldmother his wyffe my wyffes froke and a read petticote and a smoke.”