ph

¹ American  

Optics.

1. phot; phots.

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pH ² American  

Chemistry.

1. the symbol for the logarithm of the reciprocal of hydrogen ion concentration in gram atoms per liter, used to express the acidity or alkalinity of a solution on a scale of 0 to 14, where less than 7 represents acidity, 7 neutrality, and more than 7 alkalinity.

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Ph ³ American  

abbreviation

Chemistry.

1. phenyl.

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ph. ⁴ American  

abbreviation

1. phase.

2. phone.

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P.H. ⁵ American  

abbreviation

1. Public Health.

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pH ¹ British  

noun

1. potential of hydrogen; a measure of the acidity or alkalinity of a solution equal to the common logarithm of the reciprocal of the concentration of hydrogen ions in moles per cubic decimetre of solution. Pure water has a pH of 7, acid solutions have a pH less than 7, and alkaline solutions a pH greater than 7

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ph ² British  

abbreviation

1. Philippines

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ph. ³ British  

abbreviation

1. phase

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Ph ⁴ British  

symbol

1. phenyl group or radical

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pH Scientific  

/ pē′āch′ /

1. A numerical measure of the acidity or alkalinity of a solution, usually measured on a scale of 0 to 14. Neutral solutions (such as pure water) have a pH of 7, acidic solutions have a pH lower than 7, and alkaline solutions have a pH higher than 7. The pH of lemon juice is 2.4; that of household ammonia is 11.5. The normal pH for human blood is 7.4.

2. ◆ The letters pH stand for potential of hydrogen, since pH is effectively a measure of the concentration of hydrogen ions (that is, protons) in a substance. The pH scale was devised in 1923 by Danish biochemist Søren Peter Lauritz Sørensen (1868–1969).

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pH Cultural  

1. In chemistry, a measure of the strength of an acid or a base. A neutral solution has a pH of 7; acids a pH between 0 and 7; bases a pH from 7 to 14. Specially treated strips of paper (see litmus), or more precise instruments, may be used to measure pH.

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Example Sentences

Little Sofia�the ph was inserted later because it seems more exotic to the Italian eye�was turned over to a hired wet nurse.

From Time Magazine Archive

Such absurdities as having f, ff, gh and ph represent one single sound would be eliminated.

From Time Magazine Archive

Having been raised with a language that contains such combinations as "rhythm," "syzygy" and "gnathic," and in which gh, ph and ff can all sound alike, I don't see what the fuss is about.

From Time Magazine Archive

Mom talks to Carol, the receptionist explains something on the ph one, and Jason’s mother and Mrs. Frost discuss good restaurants that accommodate wheelchairs.

From "Rules" by Cynthia Lord

At the same time the pharynx, ph, and the wide anterior end of the oesophagus, oe, are cut open, exposing the glottis, gs, and vocal cords, vc.

From Development of the Digestive Canal of the American Alligator by Reese, C. M.