noun
A person engaged in prayer, often in a religious context. Can refer to anyone praying, but may carry a slightly formal or literary tone.
教会には熱心な祈祷者が集まっていた。
Devout worshippers had gathered at the church.
彼は毎朝、静かな祈祷者として知られている。
He is known as a quiet person who prays every morning.
Compound of 祈祷 (kitō, 'prayer') + 者 (-sha, 'person'). The spelling 祈祷者 is the standard modern form.