Definition of "explosive"
adjective
comparative more explosive, superlative most explosive
Having the character of an explosion.
(cellular automata) Of a specific cellular automaton rule, tending to exhibit infinite and unpredictable growth when starting from finite random patterns.
Quotations
For example, putting a 1 at (0: 1,1) will cause explosive growth in all directions, putting a 1 at (0: 0,2A) will cause pairs of diagonal cells in a 2x2 square to alternate on and off, putting a 1 at (1: 4,4) will cause all solid 1 areas to stay 1 for another cycle, etc.
1994 April 4, Robert Andreen, “CA rules”, in comp.theory.cell-automata (Usenet)
(linguistics, dated) A plosive.