Cochlea

( κοχλίας, i. e. a snail with spiral shell). Any object of spiral shape, like a screw; and so a worm and screw as a mechanical power in oil-, wine-, . pre es; the “Arch i me dean Screw,” or “water-snail” for raising water; the revolving door through which the wild beasts were let out into the amphitheatre; and other contrivances similar to the Italian ruota, by which persons can be introduced through a wall without opening a door; also a spiral staircase, .