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ph

1 American  
Optics.

  1. phot; phots.

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.

Ph 3 American  

abbreviation

Chemistry.

  1. phenyl.

ph. 4 American  

abbreviation

  1. phase.

  2. phone.

P.H. 5 American  

abbreviation

  1. Public Health.

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

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
ph 2 British  

abbreviation

  1. Philippines

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
ph. 3 British  

abbreviation

  1. phase

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
Ph 4 British  

symbol

  1. phenyl group or radical

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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).

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.

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

In 2024, according to the National Science Foundation, about 1 in 3 newly minted economics Ph.D.s in the U.S. were women, a considerably lower share than in other social sciences, business, the humanities and scientific disciplines.

From Salon

The gut may help process lactate and regulate pH levels, both of which can influence physical output and recovery.

From Science Daily

By adjusting the chemical composition and pH of the reactant solutions, they altered both the size and properties of the ultrasmall openings.

From Science Daily

"We were able to vary the behavior and effective size of the ultrasmall pores by changing the composition and pH of the reactant solutions," reports Tomoji Kawai, senior author.

From Science Daily

Maybe it’s the way the planet ignores these sports for three years and 50 weeks before comically leaning in like we’re all Ph.D.s in lutzes and double cork 1080s.

From The Wall Street Journal

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.