Definition of


  1. (noun, attribute) (from potential of Hydrogen) the logarithm of the reciprocal of hydrogen-ion concentration in gram atoms per liter; provides a measure on a scale from 0 to 14 of the acidity or alkalinity of a solution (where 7 is neutral and greater than 7 is more basic and less than 7 is more acidic)

via WordNet, Princeton University

Synonyms of Ph

ph scale

Alternate forms of Ph

Hyponyms: acidity, alkalinity, neutrality

Hypernyms: hydrogen ion concentration

Origin of the word Ph

  1. 1909, from Ger. PH, introduced by S.P.L. S?rensen, from P, for Ger. Potenz "potency, power" + H, symbol for the hydrogen ion that determines acidity or alkalinity. more
  2. consonantal digraph, now usually representing "f," originally the combination used by Romans to represent Gk. letter phi (cognate with Skt. -bh-, Gmc. -b-), which at first was an aspirated "p," later the same sound as Ger. -pf-, but by 2c. B.C.E. had become a simple sound made by blowing through the lips (bilabial spirant). Roman "f," like modern Eng… more

via Online Etymology Dictionary, ©2001 Douglas Harper

Note: If you're looking to improve your vocabulary right now, we highly recommend Ultimate Vocabulary Software.

Word of the Moment


the baggage and equipment carried by an army