from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. Any of various organic compounds containing four pyrrole rings, occurring universally in protoplasm, and functioning as a metal-binding cofactor in hemoglobin, chlorophyll, and certain enzymes.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. Any of a class of heterocyclic compounds containing four pyrrole rings arranged in a square; they are important in biochemistry in a form with a metal atom in the central cavity (hemoglobin with iron, chlorophyll with magnesium, etc.).

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. any of various pigments distributed widely in living tissues


from The American Heritage® Dictionary of the English Language, 4th Edition

Greek porphurā, shellfish yielding purple dye, purple + -in.


  • What is more exciting is that the dye Cambell and Partridge developed (made from a biological pigment called porphyrin, a component of chlorophyll) makes a dye-sensitized solar cells far more practical to produce.

    We Blog A Lot

  • And there is a substantial scientific consensus that oil was formed by biological pathways since the abiotic pathway can not explain optical activity and porphyrin-type materials there.

    Coyote Blog » Blog Archive » A Great Example Why Peak Oil Theory Has Never Been That Compelling to Me

  • [I should have had pears here but forgot to put them on the table, so I will be eating pears this week] cold blueberry soup with mango and cardamom lefse chocolate bread choice of butter, apple butter, or strawberry preserves (the latter two made by porphyrin) roasted yams with sea salt and rosemary gravlax scrambled eggs with tomatoes, basil, and sharp cheddar.

    Barnstorming on an Invisible Segway

  • She expects that we will judge reasonably about time issues -- most of the time if it's 3 a.m. and I'm thinking, "Hmm, should this go into the ER?", it should go into the ER where the people are awake already, rather than waking porphyrin.

    mrissa: I don't like this tradition at all.

  • And I didn't even get to the -- oh, wait, those are for surprises. markgritter, timprov, and I met porphyrin at Taste of Scandinavia to do St. Anthony Park Art Fest today.

    mrissa: And I didn't even get to the--oh, wait, those are for surprises.

  • I am still awfully run-down, and porphyrin says I will be awhile longer probably, but I found the time and energy to make something else in the kitchen yesterday, beyond the lamb stew and yams and blackberries that were the main part of dinner.

    mrissa: Having, eating.

  • I realize this is not as useful to people who don't have a porphyrin.

    mrissa: Having, eating.

  • Anyway, I'm very pleased with the meal I've thought of and halfway put together to feed the godkids and porphyrin and Mike tonight, but I'm a little alarmed that it seems to use all the food in the house.

    mrissa: Whoooosh.

  • I am pretty tired, and it suddenly occurred to me last night, with a ping that was nearly audible, that porphyrin had said that I would be back to eighty to ninety percent awhile back, as the pneumonia went away.

    Barnstorming on an Invisible Segway

  • Last night I was home, and Dad had just left, and I was drinking milk from my favorite big blue mug and beaming weary beatitudes upon markgritter and timprov and Ista and porphyrin and Mike and the kids.

    Barnstorming on an Invisible Segway


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