The father of your father or mother.

synonyms: gramps, grandad, granddad, granddaddy, grandpa.

Roget 166: paternity; parentage; consanguinity etc. 11.    parent; father, sire, dad, papa, paterfamilias, abba^†; genitor, progenitor, procreator; ancestor; grandsire^†, grandfather; great-grandfather; fathership^†, fatherhood; mabap^†.    house, stem, trunk, tree, stock, stirps, pedigree, lineage, line, family, tribe, sept, race, clan; genealogy, descent, extraction, birth, ancestry; forefathers, forbears, patriarchs.    motherhood, maternity; mother, dam, mamma, materfamilias [Lat.], grandmother.    ... show more

Roget 130: veteran, old man, seer, patriarch, graybeard; grandfather, grandsire; grandam; gaffer, gammer; crone; pantaloon; sexagenarian, octogenarian, nonagenarian, centenarian; old stager; dotard etc. 501.    preadamite^†, Methuselah, Nestor, old Parr; elders; forefathers etc. (paternity) 166.    ... show more

Dutch: bompa, grootpapa, grootvader, opa
Polish: dziadek