porphyrin - WordReference.com Dictionary of English

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- - pork pie
  - pork scratchings
  - pork-pie hat
  - porker
  - porkling
  - porky
  - porn
  - pornography
  - porous
  - porphyria
  - porphyrin
  - porphyritic
  - porphyry
  - porpoise
  - porridge
  - porringer
  - Porro prism
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porphyrin

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Concise Oxford English Dictionary © 2008 Oxford University Press:
porphyrin /ˈpɔːfɪrɪn/

▶noun Biochemistry a pigment (e.g. haem or chlorophyll) whose molecule contains a flat ring of four linked heterocyclic groups.

– origin early 20th cent.: from Gk porphura ‘purple’ + -in1.

'porphyrin' also found in these Oxford entries:

haem - porphyria

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