Eldmother definitions

(dialectal or obsolete) A grandmother.
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(dialectal or obsolete) A mother-in-law.
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(obsolete) A female ancestor.
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Origin of eldmother

From Middle English eldmoder, from Old English ealdmōdor (“grandmother”), equivalent to eld (“old”) +‎ mother. Cognate with Scots eldmoder, eldmother (“mother-in-law”), Old Frisian aldmōder, aldemōder (“grandmother”).