鬼
キ, おに, おに

ghost, devil

JLPT1 G7 S10 F1557

Originally, an abbreviated form# of 旡 engorgement + the obsolete "head" element described in 思 (specifically, a skull with openings at top; compare also in this context 遷 soul departing from the body) → mysterious, large and lumpy being → *ghost/spirit*; *devil*; *demon*; *ogre*.

[Full Kanji Etymology List]