combining form
variants: or


Definition of arsen-

  1. :  arsenic; specifically :  containing the grouping −As=As− analogous to the azo group arsenobenzene

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 arsen-

International Scientific Vocabulary, from arsenic

Seen and Heard

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


feeling or affected by lethargy

Get Word of the Day daily email!