P


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P,

16th letter of the alphabetalphabet
[Gr. alpha-beta, like Eng. ABC], system of writing, theoretically having a one-for-one relation between character (or letter) and phoneme (see phonetics). Few alphabets have achieved the ideal exactness.
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, representing the voiceless bilabial stop. It corresponds to Greek pi, but in form it looks like Greek rho (see RR,
18th letter of the alphabet, corresponding to Greek rho. When in Latin alphabets the letters for p and r became similar in appearance, the rho form (P; which at first was used for the r sound) was restricted to the p
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). For the technical use of P in higher criticism, see Old TestamentOld Testament,
Christian name for the Hebrew Bible, which serves as the first division of the Christian Bible (see New Testament). The designations "Old" and "New" seem to have been adopted after c.A.D.
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. In chemistry P is the symbol of the element phosphorusphosphorus
[Gr.,=light-bearing], nonmetallic chemical element; symbol P; at. no. 15; at. wt. 30.97376; m.p. 44.1°C;; b.p. about 280°C;; sp. gr. 1.82 at 20°C;; valence −3, +3, or +5.
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P

(science and technology)
(chemistry)
(fluid mechanics)
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.

P

1. On drawings, abbr. for page.
2. Abbr. for pole.
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.

P

pharmacy only: used to label medicines that can be obtained without a prescription, but only at a shop at which there is a pharmacist
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005