Disintegration

P118 describes this as a special condition caused by corrosion damage (such as from a Corrosion Attack) which reduces a target to -10xHP.
Dissolved and Disintegrated and Vaporized are used synonymously as the past-tense conjugation of the noun "disintegrate", so this process could also be called "dissolve" or "vaporize". The -ation suffix equivalents would then be "vaporizement" or "dissolvement" although these are not actual words.
This is distinct from total bodily destruction as described in the preceding Instant-Death Attacks section, which is what happens when OTHER damage types cause something to reach -10xHP.
The key difference appears to be that "Resurrection is impossible".
At the point of Certain death (-5xHP) one presumably takes on some sort of Unliving template for a corpse, which should make it more difficult to shift from -5xHP to -10xHP via Piercing/Impaling attacks.
It's not the most realistic rule, instead the benefit of Corrosive damage would be in getting rid of the DR provided to the bones as implied by Skeleton templates.
Category:Rules