apocalyptist

from The Collaborative International Dictionary of English v.0.48

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.
   [1913 Webster]