| subacid | (adjective) slightly sour to the taste | - |
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| subacute | (adjective) less than acute; relating to a disease present in a person with no symptoms of it | - |
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| subalpine | (adjective) growing at high altitudes | Synonyms: alpestrine |
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| subaltern | (adjective) inferior in rank or status | Synonyms: junior-grade, lower-ranking, lowly, petty, secondary |
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| subaquatic | (adjective) partially aquatic; living or growing partly on land and partly in water | Synonyms: semiaquatic |
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| (adjective) growing or remaining under water | Synonyms: subaqueous, submerged, submersed, underwater |
| subaqueous | (adjective) growing or remaining under water | Synonyms: subaquatic, submerged, submersed, underwater |
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| subarctic | (adjective) of or relating to latitudes just south of the Arctic Circle | - |
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| subartesian | (adjective) (of water) rising naturally in a well to a height appreciably above that of the surrounding water table but not flowing out of the well | - |
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| subatomic | (adjective) of or relating to constituents of the atom or forces within the atom | - |
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| (adjective) of smaller than atomic dimensions | - |