n. Plural form of cirrus. Grouped cilia that function as "legs" in certain species of protists.
the GNU version of the Collaborative International Dictionary of English
noun-plural. See cirrus.
The Century Dictionary and Cyclopedia
n. Plural of cirrus.
Word Usage
"Modifications from the full body covered norm include a single ring of cilia, grouped ciliary organelles called cirri, and restriction of cilia to feeding tentacles."