from The Century Dictionary.
- noun In geology, a burst of name or incandescent material from a volcano.
Sorry, no etymologies found.
Hence the Stoic definition of the Void or Infinite as that into which the cosmos is resolved at the efflagration.
In the efflagration, when everything went back to the primeval aether, the universe would be pure soul and alive equally through and through.
In the efflagration the two would be fused into one in the single substance of aether.