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PYRROLINE

A reduction product of pyrrole obtained by treating it with zinc and glacial acetic acid. It is a colourless liquid, bp 91

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PYRUMA

TN for a fireclay cement used in forming heat- resistant joints.

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PYTHAGORAS'S THEOREM

That the square on the hypotenuse of a right-angled triangle is equal to the sum of the squares on the other two sides.

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PYURIA

The presence of pus in the urine.

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PYX, TRIAL OF THE

Periodic official testing of sterling coinage.

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PYXIDIUM, PYXIS

A capsule dehiscing by means of a transverse circular split, the top coming off like a lid.

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