noun
spirit medium
A person who acts as an intermediary between the living and the spirits of the dead, often in a spiritualist or religious context.
彼女は霊媒として、死者の言葉を伝えると言われている。
She is said to convey the words of the dead as a spirit medium.
Compound of 霊 (rei, 'spirit') and 媒 (bai, 'mediator'). The term likely entered Japanese through translations of Western spiritualist concepts in the late 19th or early 20th century.