Ark, the BrE AmE
1 . ( also Noah's Ark ) in the Old Testament of the Bible, the large boat that Noah built for his family and for two members of every type of animal in the world, so that they would be safe from the great ↑ flood that covered the world
2 . out of the Ark informal very old or old-fashioned:
Some of the school's computer equipment is out of the Ark.