pH
Concise Oxford English Dictionary © 2008 Oxford University Press:
pH/piːˈeɪtʃ/
▶noun Chemistry a figure expressing acidity or alkalinity on a logarithmic scale on which 7 is neutral, lower values are more acid, and higher values more alkaline.
– origin early 20th cent.: from p representing Ger. Potenz ‘power’ + H, the symbol for hydrogen (the pH being derived from the reciprocal of the hydrogen-ion concentration).
'pH' also found in these Oxford entries:
acid
- acidic
- alkaline
- allograph
- buffer
- clenbuterol
- digraph
- indicator
- isoelectric focusing
- neutral
- phi
- phosphine
- thalidomide
- universal indicator
