A mother of someone's parent. / A female ancestor or progenitor.

plural of grandmother

The grandmotherly behaviour of a grandmother towards her grandchildren.

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The mother of one's grandparent.

Used other than figuratively or idiomatically: see maternal, grandmother. (This entry is a translation hub.)

Used other than figuratively or idiomatically: see paternal, grandmother. (This entry is a translation hub.)

Alternative spelling of great-grandmother

plural of great-grandmother

the mother of one's son- or daughter-in-law, as common grandmother of their children; the relationship between women who have grandchildren in common; maternal grandmother vis-à-vis paternal grandmother.