*apocalyptical*

{ } a. [ Gr. &unr_;. ] 1. Of or pertaining to a revelation, or, specifically, to the Revelation of St. John; containing, or of the nature of, a prophetic revelation. [ 1913 Webster ]

2. pertaining to, characteristic of, or resembling an apocalypse, in senses 3 or 4. [ 1913 Webster ]

Apocalyptic number, the number 666, mentioned in Rev. xiii. 18., in which it is described as the number of the “beast of the earth”. It has been variously interpreted. Some fundamentalist Christians consider it to be the number of the Devil, and avoid or fear objects containing that number. [ 1913 Webster +PJC ]