Hopefully I can get this straight:
Dead rock - base rock that really didn't have anything growing on it, or has been out of water for a while. Generally used in conjunction w/
LR.
Live Rock - Rock that has critters and beneficial bacteria growing on it - usually what you see at the
LFS already in the tanks with the livestock (if already cured)
Cured Rock - Rock that has been "cycled" - usually what you see at the
LFS already in the tanks with the livestock.
Un-Cured Rock - Rock that has not been "cycled", mostly has dead or dying stuff on it.