| titratable acidity test | The number of milliliters of 0.1 n NaOH required to neutralise a 24-hr specimen of urine. (05 Mar 2000) |
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| acidity | <chemistry> The quality of being acid or sour, containing acid (hydrogen ions). Origin: L. Aciditas (18 Nov 1997) |
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| gastric acidity determination | Gastric analysis for determination of free acid or total acid. (12 Dec 1998) |
| oesophageal acidity test | <investigation> A test which measures the frequency and duration of stomach acid that enters the oesophagus. After swallowing a thin tube into your stomach the tube is attached to a monitoring device. The pH is then monitored over time. This test is used to diagnose gastrooesophageal reflux disease. (27 Sep 1997) |