| porphyria | (noun) a genetic abnormality of metabolism causing abdominal pains and mental confusion | - |
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| porphyrin | (noun) any of various pigments distributed widely in living tissues | - |
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| porphyritic | (adjective) (of rocks) consisting of porphyry or containing large crystals in a fine groundmass of minerals | - |
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| porphyry | (noun) any igneous rock with crystals embedded in a finer groundmass of minerals | Synonyms: porphyritic rock |
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| porpoise | (noun) any of several small gregarious cetacean mammals having a blunt snout and many teeth | - |
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