Drift

a.
  1. That causes drifting or that is drifted; movable by wind or currents; as, drift currents; drift ice; drift mud.
    2. Drift anchor .
    See Sea anchor, and also Drag sail, under Drag, n.
    Drift epoch (Geol.),
    the glacial epoch.
    Drift net ,
    a kind of fishing net.
    Drift sail .
    Same as Drag sail. See under Drag, n.