Definition of billy–goat weed
: a tropical American annual low herb (Ageratum conyzoides) widely cultivated as a border and bedding plant for its bluish or white flowers
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!
Seen and Heard
What made you want to look up billy–goat weed? Please tell us where you read or heard it (including the quote, if possible).