from
The Collaborative International Dictionary of English v.0.48
Apocalyptic \A*poc`a*lyp"tic\, Apocalyptical
\A*poc`a*lyp"tic*al\, a. [Gr. ?.]
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] Apocalyptic