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• ph
  ph

  phot; phots.
• pH
  pH

  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.
• Ph
  Ph

  abbreviation

  phenyl.
• ph.
  ph.

  abbreviation

  phase.
• P.H.
  P.H.

  abbreviation

  Public Health.

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  

abbreviation

1. Philippines

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pH ² 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. 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

See Examples For:

ph pH Ph ph. P.H.

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

Such characters or sounds as the Sanskrit kh, gh, bh, and the Greek ch, th, ph, are called aspirates.

From The New Gresham Encyclopedia. Vol. 1 Part 2 Amiel to Atrauli by Various

In the aspirates, however, the sound of h is kept distinct; dh, th, ph, bh, &c., being pronounced as in red-hot, pent-house, up-hill, abhor, &c.

From The Birth of the War-God A Poem by Kalidasa by Kalidasa

By manipulating each tank's temperature and pH levels, scientists can simulate future heatwaves and induce coral bleaching to see how fish and other organisms adapt.

From Barron's ● Jul. 29, 2026

The researchers emphasized that the experiment measured only brief changes in salivary pH.

From Science Daily ● Jul. 27, 2026

The larvae can alter the pH of the sac walls, causing the resilin to expand or contract.

From Science Daily ● Jul. 27, 2026

In the short term, pH remained above the threshold associated with enamel damage.

From Science Daily ● Jul. 27, 2026

I worked hard to keep it at a pH of 6.5, but I agreed to return because he seemed to be very excited about the aptitude tests and I thought that he might be depressed.

From "Counting by 7s" by Holly Goldberg Sloan

"The lichens that live on the granite need this acidic environment to exist and the paint has basically changed the Ph and chemistry of the rock."

From BBC ● May 4, 2022

Even the rain water that lands on the maintenance is harvested, and put through a sulfur burner if the Ph is too acidic.

From Golf Digest ● Oct. 16, 2013

Photograph: Ph: Zade Rosenthal The runaway success of Avengers Assemble helped Cineworld almost double pre-tax profits to £13.4m in the first half of 2012, despite an almost 12% year-on-year fall in cinema advertising.

From The Guardian ● Aug. 16, 2012

Ph = the poem of the Phoenix, in Gr or BR. pl. = plural.

From A Concise Anglo-Saxon Dictionary For the Use of Students by Hall, J. R. Clark (John R. Clark)

Concanen having commented in the Supplement to the Profound upon the impropriety "of making an English clown call a well-known bird by a classical name," Pope wrote in the margin, "Spenser and Ph."

From The Works of Alexander Pope, Volume 1 New Edition by Pope, Alexander

DURINN, prob. from dur, a light sleep, to fall asleep; whence prob. the E. to doze, and ph. also dusk.

From The Elder Eddas of Saemund Sigfusson; and the Younger Eddas of Snorre Sturleson by Saemund Sigfusson

Fig. 94.—A, cross-section of the stem of the shepherd’s-purse, including a fibro-vascular bundle, × 150. ep. epidermis. m, ground tissue. sh. bundle sheath. ph. phloem. xy. xylem. tr. a vessel.

From Elements of Structural and Systematic Botany For High Schools and Elementary College Courses by Campbell, Douglas Houghton

VANIR, beautiful; with the L. venustus and Venus, and ph. with the E. wench.

From The Elder Eddas of Saemund Sigfusson; and the Younger Eddas of Snorre Sturleson by Saemund Sigfusson

THROR, ph. from v. throa, to increase, to amplify.

From The Elder Eddas of Saemund Sigfusson; and the Younger Eddas of Snorre Sturleson by Saemund Sigfusson

This experiment was repeated with the tinct. tolutanæ, ph. ed. and with sp, vinos. camp. and the result was entirely the same.

From Experiments and Observations on Different Kinds of Air by Priestley, Joseph

The statement identifies the man who was arrested as P.H., a Canadian; Vincenzo Leo, the duty officer of the local Italian police, confirmed it was Mr. Haggis.

From New York Times ● Jun. 19, 2022

None of the articles — on, for example, Oscar Wilde, the poet Tasso and the neglected comic novelist P.H.

From Washington Post ● Jul. 1, 2020

“The situation is grim, especially in the coastal parts of Kerala, given the continuous rains,” P.H.

From Reuters ● Aug. 9, 2018

He found it in Connersville, Indiana, where the P.H.

From Scientific American ● Feb. 21, 2014

It is known in American history as the scene of a memorable battle, which took place on the 19th of October 1864, between the Union army under Major-General P.H.

From Encyclopaedia Britannica, 11th Edition, Volume 5, Slice 5 "Cat" to "Celt" by Various