| acaracide | (noun) a chemical agent used to kill mites | Synonyms: acaricide |
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| acid | (noun) street name for lysergic acid diethylamide | Synonyms: back breaker, battery-acid, dose, dot, Elvis, loony toons, Lucy in the sky with diamonds, pane, superman, window pane, Zen |
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| (noun) any of various water-soluble compounds having a sour taste and capable of turning litmus red and reacting with a base to form a salt | - |
| acidemia | (noun) a blood disorder characterized by an increased concentration of hydrogen ions in the blood (which falls below 7 on the pH scale) | - |
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| acidification | (noun) the process of becoming acid or being converted into an acid | - |
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| acidimetry | (noun) volumetric analysis using standard solutions of acids to measure the amount of a base present | - |
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| acidity | (noun) pH values below 7 | - |
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| (noun) the property of being acidic | Synonyms: sour, sourness |
| (noun) the taste experience when something acidic is taken into the mouth | Synonyms: acidulousness |
| acidophil | (noun) an organism that thrives in a relatively acid environment | Synonyms: acidophile |
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| acidophile | (noun) an organism that thrives in a relatively acid environment | Synonyms: acidophil |
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| acidophilus | (noun) a bacterium that is used to make yogurt and to supplement probiotics | Synonyms: Lactobacillus acidophilus |
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| acidosis | (noun) abnormally high acidity (excess hydrogen-ion concentration) of the blood and other body tissues | - |
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| acidulousness | (noun) the taste experience when something acidic is taken into the mouth | Synonyms: acidity |
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| aminoaciduria | (noun) abnormal presence of amino acids in the urine; usually a symptom of metabolic defects | - |
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| antacid | (noun) an agent that counteracts or neutralizes acidity (especially in the stomach) | Synonyms: alkaliser, alkalizer, antiacid, gastric antacid |
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| antiacid | (noun) an agent that counteracts or neutralizes acidity (especially in the stomach) | Synonyms: alkaliser, alkalizer, antacid, gastric antacid |
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| bacteriacide | (noun) any chemical agent that destroys bacteria | Synonyms: bactericide |
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| characid | (noun) any freshwater fish of the family Characinidae | Synonyms: characin, characin fish |
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| hyperacidity | (noun) excessive acidity | - |
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| ketoacidosis | (noun) acidosis with an accumulation of ketone bodies; occurs primarily in diabetes mellitus | Synonyms: diabetic acidosis |
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| ketoaciduria | (noun) excessive amounts of ketone bodies in the urine as in diabetes mellitus or starvation | Synonyms: acetonuria, ketonuria |
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| larvacide | (noun) an insecticide that kills the larvae of insects | - |
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| oxyacid | (noun) any acid that contains oxygen | Synonyms: oxygen acid |
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| placidity | (noun) a disposition free from stress or emotion | Synonyms: quiet, repose, serenity, tranquility, tranquillity |
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| (noun) a feeling of calmness; a quiet and undisturbed feeling | Synonyms: placidness |
| placidness | (noun) a feeling of calmness; a quiet and undisturbed feeling | Synonyms: placidity |
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| thermoacidophile | (noun) archaebacteria that thrive in strongly acidic environments at high temperatures | - |
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| uricaciduria | (noun) presence of abnormal amounts of uric acid in the urine; symptom of gout | - |
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