芥子色: mustard

color / complexion

historic, historical / already-happened, past / former, old, traditional

historian

study of history

(Internet slang, especially anime and manga fandom) events or things from the past which one wants to whitewash/erase from history (due to it being embarrassing, poorly received, etc.); dark past

oral history

historicism

Alternative spelling of 紫苑: an aster, a Michaelmas daisy: Aster tataricus

Alternative spelling of 紫苑: a female given name