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pyromania a psychological disorder characterized by the overpowering desire to start fires.
pyrometer an electrical instrument used to measure high temperatures.
pyrophoric of certain metals, capable of igniting spontaneously in air or within a nuclear reactor.
pyrosulfuric acid a corrosive acid used in the making of explosives and dyes.
pyrotechnic of or relating to fireworks. [3 definitions]
pyrotechnics (used with a sing. or pl. verb) the practice or art of making or using fireworks. [3 definitions]
pyroxylin a highly flammable nitrocellulose used in the manufacture of artificial silk, plastics, lacquer, and the like.
Pyrrhic victory a victory or achievement won at too great a cost.
pyrrole a colorless toxic compound that occurs in natural substances such as chlorophyll and various hydrocarbons.
Pythagoras a Greek philosopher and mathematician (582?-500? B.C.).
Pythagorean theorem in geometry, the theorem that in a right triangle the square of the hypotenuse is equal to the sum of the squares of the other two sides.
Pythian of or pertaining to ancient Delphi, the temple of Apollo there, or the oracle of that temple. [2 definitions]
python any of a number of nonpoisonous snakes of the Eastern Hemisphere that kill by crushing and suffocating their victims. [3 definitions]
pythoness a priestess of Apollo at Delphi, believed to be possessed by an oracle. [2 definitions]
pyuria the presence of pus in the urine.
pyx in some Christian denominations, a container for storing or transporting Communion wafers. [2 definitions]
pyxis a lidded vase or box, usu. cylindrical, that was used to store toilet articles in ancient Greece and Rome. [3 definitions]
Q abbreviation of "question."
q the seventeenth letter of the English alphabet.
Qatar a Middle Eastern country in eastern Arabia on a peninsula in the Persian Gulf.
Q-Celtic the branch of the Celtic languages that includes Gaelic and Irish Gaelic, in which a "k" sound replaced the Proto-Indo-European "kw" sound.