noun re·tror·sine \rə̇‧ˈtrȯrˌsēn, -sə̇n\

Definition of retrorsine



  1. :  a poisonous crystalline alkaloid C18H25NO6 found in various plants of the genus Senecio (as S. retrorsus)

Love words? You must — there are over 200,000 words in our free online dictionary, but you are looking for one that’s only in the Merriam-Webster Unabridged Dictionary.

Join MWU now and get access to America’s largest dictionary, with:

  • 300,000 words that aren't in our free dictionary
  • Expanded definitions, etymologies, and usage notes
  • Advanced search features
  • Ad free!

Origin and Etymology of retrorsine

New Latin retrorsus (specific epithet of Senecio retrorsus) (from Latin, bent backwards) + English -ine

Seen and Heard

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


to help become familiar with something

Get Word of the Day daily email!