Definition of Rhytisma
:a genus of fungi (family Phacidiaceae) forming black stromata — see tar spot
What's Trending Now
More Trending Words
Rhytisma
noun
Rhy·tis·ma
\
rə̇ˈtizmə
,
rīˈt-
\
Explore M-W
There's more!
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.
Start your free trial today and get unlimited access to America's largest dictionary, with:
- More than 250,000 words that aren't in our free dictionary
- Expanded definitions, etymologies, and usage notes
- Advanced search features
- Ad free!
Origin and Etymology of rhytisma
New Latin, from Greek rhytisma patch
Seen and Heard
What made you want to look up Rhytisma? Please tell us where you read or heard it (including the quote, if possible).
Writing? Check your grammar now!