From Longman Dictionary of Contemporary Englishgrangran /ɡræn/ noun [countable] British English informalFAMILY grandmother
Examples from the Corpus
gran• Her gran wasn't much better.• Matthew spends 2 weeks with his gran, a week with his Aunt.• But the worst ones of all are the other gran and grandad.• But you and your gran are out of order with your plotting.• And then your gran is off to bed. 