Polycystis

noun

Poly·​cys·​tis

ˌpälēˈsistə̇s,

-lə̇ˈs-

: a genus of free-floating colonial blue-green algae (family Chroococcaceae) often forming netted or irregular masses and frequently causing water bloom

Word History

Etymology

New Latin, from poly- + -cystis

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!