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noun - (from potential of Hydrogen) the logarithm of the reciprocal of hydrogen-ion concentration in gram atoms per liter; provides a measure on a scale from 0 to 14 of the acidity or alkalinity of a solution (where 7 is neutral and greater than 7 is more basic and less than 7 is more acidic);

noun - an antiviral drug used against HIV; interrupts HIV replication by binding and blocking HIV protease; often used in combination with other drugs
someone who can be employed as a detective to collect information
the 16th letter of the Greek alphabet
the ratio of the circumference to the diameter of a circle; approximately equal to 3.14159265358979323846...
the scientist in charge of an experiment or research project

noun - a soft silvery metallic element of the rare earth group having no stable isotope; was discovered in radioactive form as a fission product of uranium
an examination and dissection of a dead body to determine cause of death or the changes produced by disease
modulation of the phase of the carrier wave
the person who holds the position of head of the government in the United Kingdom

noun - a European river; flows into the Adriatic Sea
a noncommissioned officer in the Navy or Coast Guard with a rank comparable to sergeant in the Army
a radioactive metallic element that is similar to tellurium and bismuth; occurs in uranium ores but can be produced by bombarding bismuth with neutrons in a nuclear reactor
an independent agency of the federal government responsible for mail delivery (and sometimes telecommunications) between individuals and businesses in the United States

noun - a promotion intended to create goodwill for a person or institution
a self-governing commonwealth associated with the United States occupying the island of Puerto Rico
a soft yellowish-white trivalent metallic element of the rare earth group; can be recovered from bastnasite or monazite by an ion-exchange process

noun - a heavy precious metallic element; grey-white and resistant to corroding; occurs in some nickel and copper ores and is also found native in some deposits

noun - a solid silvery grey radioactive transuranic element whose atoms can be split when bombarded with neutrons; found in minute quantities in uranium ores but is usually synthesized in nuclear reactors; 13 isotopes are known with the most important being plutonium 239

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