noun
deceased imperial grandfather
Formal, historical term referring specifically to the deceased grandfather of an emperor. Used in imperial household contexts.
皇祖考の御霊に奉告する儀式が行われた。
A ceremony was held to report to the spirit of the deceased imperial grandfather.
Refers to the deceased father of an emperor, a more direct ancestor than 皇祖考.
Composed of 皇 (imperial), 祖 (ancestor), and 考 (deceased father/grandfather). The exact historical derivation is uncertain; the term is used in imperial household terminology.