Syn·​edra | \ sə̇ˈnēdrə, sə̇ˈned-, ˈsinəd- \

Definition of Synedra

: a large genus related to Fragilaria and comprising elongated linear or commonly needle-shaped solitary or loosely colonial diatoms that may cause earthy odors in water supplies

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!

History and Etymology for Synedra

New Latin, from Greek synedros sitting together, from syn- + -edros (from hedra seat)

Keep scrolling for more

Learn More about Synedra

Statistics for Synedra

Cite this Entry

“Synedra.” The Dictionary, Merriam-Webster Inc., Accessed 13 December 2019.

Comments on Synedra

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


easily led, controlled, or managed

Get Word of the Day daily email!

Test Your Vocabulary

Semantic Drift Quiz

  • a twisty river
  • Which of the following was once a synonym for fun?
Spell It

Can you spell these 10 commonly misspelled words?

Dictionary Devil

Test Your Knowledge - and learn some interesting things along the way.

Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!