What's Trending Now
More Trending Words
macrocystis
noun
mac·ro·cys·tis
\ˌmakrōˈsistə̇s\
Definition of macrocystis
1 capitalized : a genus of brown algae (family Laminariaceae) that are often very large and consist of a slender stipe with pinnate fronds and floats — see giant kelp
2 plural macrocystis : any plant of the genus Macrocystis
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 macrocystis
New Latin, from macr- + -cystis
Seen and Heard
What made you want to look up macrocystis? Please tell us where you read or heard it (including the quote, if possible).
Writing? Check your grammar now!