Dungeon Crawler has been what alot of gamers/companies have been calling these types of games for along time now. You can be as literal as you like with it, but that's been the case for along time now. They're also called Action/RPGs, but that's a much more vague term. You can call alot of games Action/RPGs that play nothing like Diablo, Torchlight, Baldur's Gate, etc... While most dungeon crawlers don't take place in dungeon 100% of the time, the style of gameplay of these games is what alot of gamers nowadays refer to as a dungeon crawler.
Diablo 1, and torchlight are dungeon crawlers, Baldurs gate i have not played in a while, but if i remember right had overland play and combat but could be wrong about that one. Just because you kill things, get loot, and do quests does not make it a Dungeon crawler. That would mean every RPG is a dungeon crawler, final fantasy 1-current, dragon warrior series, lufia series, chrono series, etc, you name it would all be called that, and that would not sit well with me, they are all RPG games, or now days since its active combat, Action RPG.