Quantcast
Merriam-Webster Logo
  • Dictionary
  • Thesaurus
  • Medical
  • Scrabble
  • Spanish Central
  • Learner's Dictionary

porphyrin

play
noun por·phy·rin \ˈpȯr-fə-rən\

Definition of porphyrin

  1. :  any of various compounds with a macrocyclic structure that consists essentially of four pyrrole rings joined by four =CH− groups; especially :  one (as chlorophyll or hemoglobin) containing a central metal atom and usually exhibiting biological activity



Origin of porphyrin

International Scientific Vocabulary, from Greek porphyra purple


First Known Use: 1910


Medical Dictionary

porphyrin

play
noun por·phy·rin \ˈpȯr-fə-rən\

Medical Definition of porphyrin

  1. :  any of various compounds with a structure that consists essentially of four pyrrole rings joined by four =CH− groups; especially :  one (as chlorophyll or hemoglobin) containing a central metal atom and usually having biological activity




Learn More about porphyrin


Seen and Heard

What made you want to look up porphyrin? Please tell us where you read or heard it (including the quote, if possible).

WORD OF THE DAY

February 10, 2016

to put in good humor

Get Word of the Day daily email!

WORD GAMES

Take a 3-minute break and test your skills!

image1037863653

Which of the following refers to thin, bending ice, or to the act of running over such ice?

pince-nez kittly-benders duvet spindrift
Name That Thing

10 quick questions: hear them, spell them, and see how your skills compare to the crowd.

TAKE THE QUIZ
SCRABBLE® Sprint

Test Your Knowledge - and learn some interesting things along the way.

TAKE THE QUIZ