cirri

[sir-ahy]
noun Botany, Zoology.
a plural of cirrus.
Dictionary.com Unabridged

cirri-

variant of cirro-.

cirrus

[sir-uhs]
noun, plural cirrus for 1, cirri [sir-ahy] , for 2, 3.
1.
Meteorology.
a.
a cloud of a class characterized by thin white filaments or narrow bands and a composition of ice crystals: of high altitude, about 20,000–40,000 feet (6000–12,000 meters).
b.
a cirriform cloud.
2.
Botany. a tendril.
3.
Zoology.
a.
a filament or slender appendage serving as a foot, tentacle, barbel, etc.
b.
the male copulatory organ of flatworms and various other invertebrates.

Origin:
1700–10; < Latin: a curl, tuft, plant filament like a tuft of hair

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
World English Dictionary
cirri (ˈsɪraɪ)
 
n
the plural of cirrus

cirrus (ˈsɪrəs)
 
n , pl -ri
1.  meteorol a thin wispy fibrous cloud at high altitudes, composed of ice particles
2.  a plant tendril or similar part
3.  zoology
 a.  a slender tentacle or filament in barnacles and other marine invertebrates
 b.  a hairlike structure in other animals, such as a filament on the appendage of an insect or a barbel of a fish
 
[C18: from Latin: curl, tuft, fringe]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Etymonline
Word Origin & History

cirrus
1708, "curl-like fringe or tuft," from L. cirrus "a lock of hair, tendril, curl, ringlet of hair; the fringe of a garment." In meteorology, cirrus clouds attested from 1803. So called from fancied resemblance of shape.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Science Dictionary
cirrus   (sîr'əs)  Pronunciation Key 
Plural cirri (sîr'ī')
A high-altitude cloud composed of feathery white patches or bands of ice crystals. Cirrus clouds generally form between 6,100 and 12,200 m (20,000 and 40,000 ft). See illustration at cloud.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
Feathery cirri banded with colors of maroon, blue and green.
Dorsal cirri about as long as ligules, ventral cirri shorter than the ligules.
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