SimonG: It cannot be bought anywhere legally, which very much fits my bill of abandonware.
Foxhack: You can still find used copies, just not new ones. The properties are still owned by companies that still exist. Not abandonware.
Everything is always owned by a company that still exists, unless it's part of the public domain. When a company goes under, its assets (like the game/rights/franchise/etc) go to another company. Somebody always owns them. Abandonware is when they either stop selling it for whatever reason, or they CAN'T sell it because multiple parties own pieces of it and those parties can't get along.
A game being unavailable for legitimate purchase is pretty much the only definition of abandonware. Some things only stay as abandonware for a matter of weeks or months, though, so it's not a permanent designation. It just means you can't get it except from a pawn shop.