Meridion
noun
Me·rid·i·on
\mə̇ˈridēˌän\
Definition of Meridion
: a genus (coextensive with the family Meridionaceae) of freshwater pennate diatoms having cuneate cells arranged in flat, fan-shaped, or spiral colonies and often causing odors in public water supplies
From the M-W Editors
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 meridion
New Latin, from Greek, diminutive of merid-, meris part, portion
Seen and Heard
What made you want to look up Meridion? Please tell us where you read or heard it (including the quote, if possible).
Writing? Check your grammar now!