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

pyrrole

play
noun pyr·role \ˈpir-ˌōl\

Definition of pyrrole

  1. :  a toxic liquid heterocyclic compound C4H5N that has a ring consisting of four carbon atoms and one nitrogen atom, polymerizes readily in air, and is the parent compound of many biologically important substances (as bile pigments, porphyrins, and chlorophyll); broadly :  a derivative of pyrrole

pyrrolic play \pi-ˈrō-lik\ adjective


Origin of pyrrole

Greek pyrrhos


First Known Use: 1835


Medical Dictionary

pyrrole

play
noun pyr·role \ˈpi(ə)r-ˌōl\

Medical Definition of pyrrole

  1. :  a toxic liquid heterocyclic compound C4H5N that has a ring consisting of four carbon atoms and one nitrogen atom, polymerizes readily in air, and is the parent compound of many biologically important substances (as bile pigments, porphyrins, and chlorophyll); broadly :  a derivative of pyrrole

pyrrolic \pir-ˈō-lik\play adjective



Learn More about pyrrole


Seen and Heard

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

WORD OF THE DAY

a timid, meek, or unassertive person

Get Word of the Day daily email!

WORD GAMES

Take a 3-minute break and test your skills!

alt-5746713d76276

Which of these is a synonym of nonplus?

disapprove soothe reduce perplex
Name That Thing

Test your visual vocabulary with our 10-question challenge!

TAKE THE QUIZ
SCRABBLE® Sprint

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

TAKE THE QUIZ