noun
Refers to the first person or entity to start a tradition, school, product, or movement. Often used in commercial or cultural contexts, such as 元祖ラーメン.
この店は元祖とんこつラーメンを名乗っている。
This shop claims to be the originator of tonkotsu ramen.
彼は日本における近代建築の元祖とさ
He is considered the pioneer of modern architecture in Japan.
noun
progenitor; founder of a family line
Used for the earliest ancestor of a family or clan. More formal and historical than 先祖.
この家系の元祖は平安時代の武士だったと伝えられている。
The progenitor of this family line is said to have been a samurai of the Heian period.
From 元 (origin) + 祖 (ancestor, founder). The combination straightforwardly means 'original ancestor' or 'first founder'.