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1. Oxford Dictionary

   porphyrin

   • IPA[ˈpɔːf(ɪ)rɪn]

   英式

   • n.
     any of a class of pigments (including haem and chlorophyll) whose molecules contain a flat ring of four linked heterocyclic groups, sometimes with a central metal atom.

   • noun: porphyrin, plural noun: porphyrins

2. • 更多解釋

   porphyrin

   • IPA[ˈpôrfərən]

   美式

   • n.
     any of a class of pigments (including heme and chlorophyll) whose molecules contain a flat ring ...

   Oxford American Dictionary