Relating to or belonging to a grandmother or grandmothers, especially on the maternal side of the family.
Formed from 'grand' plus 'maternal' (relating to mother), creating an adjective that specifies the grandmother through the mother's line, paralleling 'paternal' relationships.
This word is linguistically interesting because English doesn't always clearly distinguish maternal vs. paternal grandparents in everyday speech—we just say 'Mom's mom' or 'Dad's mom,' so 'grandmaternal' is mainly used in formal, legal, or medical contexts!
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