Etymology
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porphyria (n.)

metabolic disorder, 1923, from porphyrin (1910), the name of the type of chemical which, in imbalance, causes it, from German porphyrin (1909), chemical name, from Greek porphyros "purple" (see purple) + -in (2). Some of the compounds are purple.

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Definitions of porphyria

porphyria (n.)
a genetic abnormality of metabolism causing abdominal pains and mental confusion;
From wordnet.princeton.edu