POLLUX. β Geminorum. A bright and well-known star in the ancient constellation Gemini, of which it is the second in brightness.

POLRON. That part of the armour which covered the neck and shoulders.

POLTROON. Not known in the navy.

POLYGON. A geometrical figure of any number of sides more than four; regular or irregular. In fortification the term is applied to the plan of a piece of ground fortified or about to be fortified; and hence, in some countries, to a fort appropriated as an artillery and engineering school.

POLYMETER. An instrument for measuring angles.

POLYNESIA. A group of islands: a name generally applied to the islands of the Pacific Ocean collectively, whether in clusters or straggling.

POMELO, or Pumelo. Citrus decumana. A large fruit known by this name in the East Indies, but in the West by that of shaddock, after Captain Shaddock, who introduced it there.

POMFRET. A delicate sea-fish, taken in great quantities in Bombay and Madras.

POMMELION. A name given by seamen to the cascable or hindmost knob on the breech of a cannon.

PONCHES. Small bulk-heads made in the hold to stow corn, goods, &c.