Chapter 8, Note 1: Komatsu Kazuhiko's Definition of Yôkai

In the original Japanese: Ijôna genshô moshikuwa jibutsu, sonzai no koto 異常な現象もしくは事物・存在のこと.

Full Citation: Komatsu Kazuhiko小松和彦, "Yôkai no genshô" 「妖怪の現象」, in Kondô Gaju 近藤雅樹, ed., Zusetsu Nihon no yôkai 『図説・日本の妖怪』, (Kawade shobô shinsha, 1990), pp. 18 & 19-20.

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Two types of yôkai:  1) yôkai genshô 妖怪現象 (uncanny phenomena in general); and 2) yôkai sonzai 妖怪 存在 (specific entities such as demons, goblins, etc.)