Word of the Day : October 1, 2024 Chthonic adjective THAH-nik What it Means Chthonic means "of or relating to the underworld." It is used as a synonym of infernal. // Cleo compared entering her brother's basement bedroom to a descent into chthonic regions: it was dark and odd-smelling, and she was a little frightened of what she might find there. … Continue reading Word of the Day – Chthonic