| acid | (adjective) having the characteristics of an acid | - |
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| (adjective) being sour to the taste | Synonyms: acidic, acidulent, acidulous |
| (adjective) harsh or corrosive in tone | Synonyms: acerb, acerbic, acrid, bitter, blistering, caustic, sulfurous, sulphurous, virulent, vitriolic |
| acidic | (adjective) being or containing an acid; of a solution having an excess of hydrogen atoms (having a pH of less than 7) | - |
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| (adjective) being sour to the taste | Synonyms: acid, acidulent, acidulous |
| acidimetric | (adjective) involving or related to acidimetry | - |
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| acidophilic | (adjective) especially of some bacteria; growing well in an acid medium | Synonyms: acidophilous, aciduric |
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| acidophilous | (adjective) especially of some bacteria; growing well in an acid medium | Synonyms: acidophilic, aciduric |
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| acidotic | (adjective) having or being characterized by acidosis | - |
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| acidulent | (adjective) being sour to the taste | Synonyms: acid, acidic, acidulous |
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| acidulous | (adjective) being sour to the taste | Synonyms: acid, acidic, acidulent |
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| aciduric | (adjective) especially of some bacteria; growing well in an acid medium | Synonyms: acidophilic, acidophilous |
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| antacid | (adjective) acting to neutralize acid (especially in the stomach) | - |
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| placid | (adjective) (of a body of water) free from disturbance by heavy waves | Synonyms: quiet, smooth, still, tranquil, unruffled |
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| (adjective) not easily irritated | Synonyms: equable, even-tempered, good-tempered |
| subacid | (adjective) slightly sour to the taste | - |
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