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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.
Q.E.D. abbreviation of "quod erat demonstrandum" (Latin); which was to be demonstrated.
qintar the smaller monetary unit of Albania. (Cf. lek.)
Qoricancha an Incan sun temple located in Curzo, Peru.
qt. abbreviation of "quart" or "quarts."
q.t. (informal) abbreviation of "quiet time."
qua in the capacity of; as.
Quaalude trademark for the sedative drug methaqualone.