A formal or literary term for rain-making rituals. In everyday language, 雨乞い (あまごい) is more common.
See also: 雨乞い
Long ago, during droughts, the villagers performed rain-praying rituals.
この神社では毎年、祈雨祭が執り行われる。
At this shrine, a rain-praying festival is held every year.