a series of moored balloons, usually strung together and hung with cables, for impeding a low-level attack by enemy aircraft.
- Balloon chuck
a lathe chuck having the form of a hollow hemisphere, for enclosing and holding small parts, as balance staffs of watches, so that only their ends are exposed.
- Balloon clock
a bracket clock of the late 18th century, having a round dial on a short case with concave sides resting on bracket feet.
a porcupinefish, Diodon holacanthus, inhabiting tropical and subtropical waters.