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plus sign a mathematical sign (+) indicating addition or a positive quantity.
Pluto in Greek mythology, the god of wealth who is also identified with Hades, the Underworld. [2 definitions]
plutocracy a state or system of government in which the wealthy rule. [2 definitions]
plutocrat a member of a wealthy ruling class. [2 definitions]
plutonic of rocks, formed deep within the earth's surface by great heat and pressure and slow cooling.
plutonium a radioactive chemical element of the actinide series that has ninety-four protons in each nucleus and that is capable of explosive nuclear fission in a chain reaction, used as fuel in some types of nuclear reactors. (symbol: Pu)
pluvial having to do with rain, esp. a lot of rain; rainy. [2 definitions]
ply1 to employ (something) as a weapon or tool. [6 definitions]
ply2 a layer, as of wood products. [2 definitions]
Plymouth a U.S. town in southeastern Massachusetts. In 1620, English colonists known as the Pilgrims established a settlement called Plymouth Colony in this location, which later became the town of Plymouth.
plywood a sturdy board made from thin layers of wood tightly compressed and glued together, usu. with the grains at right angles.
Pm symbol of the chemical element promethium.
p.m. abbreviation of "post meridiem" (Latin); after noon, or the period of time from noon until midnight.
P.M. abbreviation of "Prime Minister," the chief minister and head of the cabinet in parliamentary governments.
pneumatic of, using, or concerning air or other gases. [5 definitions]
pneumatics (used with a sing. verb) the scientific study of the mechanical properties of gases.
pneumococcus a bacterium that can cause pneumonia.
pneumoencephalogram an x-ray of the spaces in the brain that contain fluid, after the replacement of the cerebrospinal fluid by air or gas.
pneumonia a serious disease caused by viruses, bacteria, or fluid in the lungs, and characterized by inflammation of one or both lungs.
pneumonic of or relating to the lungs. [2 definitions]
pneumothorax an abnormal accumulation of air in the pleural cavity, which can cause the lung to collapse.