noun
guardian deity of one's birthplace
In Shinto, the tutelary deity of the land where one was born, believed to protect the person throughout life. A specialized religious term.
産土神は、その土地に生まれた人を一生守るとされる。
The ubusunagami is said to protect a person born on that land throughout their life.
氏神 is the guardian deity of a clan or family, while 産土神 is specifically the deity of one's birthplace. In modern usage they are often conflated, but 産土神 emphasizes the connection to the land of birth.
鎮守神 is a guardian deity of a specific area or building, not necessarily tied to birth. 産土神 is personal and lifelong, linked to the place of one's birth.
Compound of 産土 (ubusuna, 'birthplace') + 神 (kami, 'god'). The exact historical origin is uncertain, but the concept is deeply rooted in Shinto folk belief.