阿公

āgōng
  1. (old) grandfather
  2. polite address for an elderly man, or a woman's father-in-law
  3. (Taiwanese) grandfather

CEDICT

old

Entry Composition

1 阿 ā
  1. prefix used before monosyllabic names, kinship terms etc to indicate familiarity
  2. used in transliteration
  3. also pr. à
2 公 gōng
  1. public
  2. collectively owned
  3. common
  4. international (e.g. high seas, metric system, calendar)
  5. make public
  6. fair
  7. just
  8. Duke, highest of five orders of nobility 五等爵位 wǔděngjuéwèi
  9. honorable (gentlemen)
  10. father-in-law
  11. male (animal)