Apocalyptic \A*poc`a*lyp"tic\, Apocalyptical \A*poc`a*lyp"tic*al\, a. [Gr. ?.]

Of or pertaining to a revelation, or, specifically, to the Revelation of St. John; containing, or of the nature of, a prophetic revelation.

Apocalyptic number, the number 666, mentioned in --Rev. xiii. 18. It has been variously interpreted.

Source: Webster's Revised Unabridged Dictionary (1913)
 

Apocalyptic \A*poc`a*lyp"tic\ ([.a]*p[o^]k`[.a]*l[i^]p"t[i^]k), Apocalyptist \A*poc`a*lyp"tist\, n. The writer of the Apocalypse.

Source: Webster's Revised Unabridged Dictionary (1913)