• Cirrus from South Kensington, 1906, May 29
    Cirrus from South Kensington, 1906, May 29
  • WordNet 3.6
    • n cirrus a slender flexible animal appendage as on barnacles or crinoids or many insects; often tactile
    • n cirrus a wispy white cloud (usually of fine ice crystals) at a high altitude (4 to 8 miles)
    • n cirrus usually coiled
    • ***
Webster's Revised Unabridged Dictionary
    • Cirrus (Zoöl) A soft tactile appendage of the mantle of many Mollusca, and of the parapodia of Annelida. Those near the head of annelids are Tentacular cirri; those of the last segment are caudal cirri.
    • Cirrus (Bot) A tendril or clasper.
    • Cirrus (Meteor) See under Cloud.
    • Cirrus (Zoöl) The external male organ of trematodes and some other worms, and of certain Mollusca.
    • Cirrus (Zoöl) The jointed, leglike organs of Cirripedia. See Annelida, and Polychæta.
    • ***
Century Dictionary and Cyclopedia
    • n cirrus In botany, a tendril; a long thread-like organ by which certain plants climb.
    • n cirrus In zoology: In Cirripedia, one of the curved multiarticulate filaments alternately protruded and retracted with a sweeping motion from the shell or carapace of a cirriped, as an acorn-shell (Balanus) or barnacle (Lepas). They are the thoracic appendages or feet of the animal, each representing an endopodite and an exopodite, borne upon a protopodite. See cut under barnacle.
    • n cirrus In Crinoidea, one of the branched filaments given off from the joints of the stem. See cut under Crinoidea.
    • n cirrus In conchology, one of the cirrose branchiæ of the Cirribranchiata or tooth-shells.
    • n cirrus In ichthyology: One of the cirrose filaments surrounding the mouth of a lancelet. A barbel in sundry fishes.
    • n cirrus In ornithology, a tuft of curly plumes on the head.
    • n cirrus In Vermes, the protrusible cirrose terminal portion of the vas deferens of a trematoid or cestoid worm; a kind of penis.
    • n cirrus One of the filamentous appendages of the parapodia in chætopodous annelids, which may be larger than the parapodia, or even replace them when atrophied.
    • n cirrus In entomology, a tuft of curled hairs such as are often seen on the legs and antennæ of insects.
    • n cirrus Some other cirrose part or organ, as the long flattened modification of ordinary cilia upon the peristomial region of many ciliate Infusoria.
    • n cirrus [capitalized] A genus of mollusks.
    • n cirrus A light fleecy cloud, formed at a great height in the atmosphere. See cloud, 1. Also called curlcloud. Often abbreviated c.
    • n cirrus One of the solid contractile tentacle-like organs on the margin of the me- dusoid of Hydromedusæ. Each cirrus is shorter than the tentacles, is provided with a terminal battery of cnidoblasts, and is perhaps an organ of offense or of defense.
    • ***
Chambers's Twentieth Century Dictionary
    • n Cirrus sir′us the highest form of clouds consisting of curling fibres: :
    • n Cirrus sir′us (bot.) a tendril
    • n Cirrus sir′us (zool.) any curled filament
    • ***


Webster's Revised Unabridged Dictionary
L., lock, curl, ringlet
Chambers's Twentieth Century Dictionary


In literature:

He looked up and saw the blue sky above fretted with cirrus clouds.
"When the Sleeper Wakes" by Herbert George Wells
The sun was then seen shining through cirrus far up.
"The Dominion of the Air" by J. M. Bacon
On the night of the 17th it cleared; light cirrus clouds covered the sky, and there was a ring about the moon.
"The South Pole, Volumes 1 and 2" by Roald Amundsen
A few white wisps of cirrus gleamed above our heads.
"The Morals of Marcus Ordeyne" by William J. Locke
As well say why a cirrus cloud is better than a sycamore and a sycamore better than a scarlet hat.
"Select Conversations with an Uncle" by H. G. Wells
His use of the cirrus in expressing mist.
"Modern Painters Volume I (of V)" by John Ruskin
The sky was light now, and far overhead a wisp of cirrus was glowing pink, a warning of coming sunrise.
"The Flying Stingaree" by Harold Leland Goodwin
The Cirrus occurs in very great variety, and in some states of the air is constantly changing.
"The Rain Cloud or, An Account of the Nature, Properties, Dangers and Uses of Rain" by Anonymous
The moon was just rising, and there was enough light to see heavy cirrus moving high overhead.
"The Wailing Octopus" by Harold Leland Goodwin
Cirrus clouds, for instance, exhibit many forms, and these so diverse that they must be due to very different causes.
"Encyclopaedia Britannica, 11th Edition, Volume 6, Slice 5" by Various
Soon the ship looked, to all outward appearances, like a cirrus formation.
"Keep Your Shape" by Robert Sheckley
Silky cirrus wisps and fringes so fine they almost escape notice.
"My First Summer in the Sierra" by John Muir
This also accounts for the ice clouds, called cirrus, being formed so high up in the atmosphere during dry weather.
"Nature's Miracles, Volume 1" by Elisha Gray
While, however, the cirrus remains a cirrus, it furnishes no rain.
"The Philosophy of the Weather" by Thomas Belden Butler
Right across the moon there were drifting several luminous cirrus streaks.
"Farthest North" by Fridtjof Nansen
Wisps of thin, cirrus cloud float for 200 miles around the storm center.
"The Complete Story of the Galveston Horror" by Various
The mean height of the cirrus is about 29,000 feet, but this cloud sometimes reaches 49,000 feet.
"Sounding the Ocean of Air" by A. Lawrence Rotch
Above the island was a group of cirrus, turned to the setting sun like an audience of intent faces.
"The Sea and the Jungle" by H. M. Tomlinson
Cirrus clouds, or others, dissolve, or cirrus have tails down.
"Reading the Weather" by Thomas Morris Longstreth
There must be text-books on how to tell the cumuli from the cirrus.
"Post-Impressions" by Simeon Strunsky

In poetry:

I saw the fragments of the cloud
Join with the nucleus form,
Cirrus to Nimbus quickly bowed--
Sure harbinger of storm.
"On Brooklyn Bridge" by Jared Barhite

In news:

"The V-tail deflects the noise upward," said Kent Vandergrift, the Cirrus pilot who flew the jet to its world debut.
Learning To Fly In A Cirrus SR22.
Chrysler designers left the boxy K-car '80s-think behind when they penned the striking, cab-forward Cirrus .
1995 Chrysler Cirrus Buyer's Guide.
What Jet Pilots Don't Get about the Cirrus Jet.
Why the Cirrus Jet brings the thrill of a jet within reach of more pilots.
Our 10 Favorite Cirrus SR22S.
Cirrus Logic is on the move, thanks to wave of growth.
Cirrus plans to fly its first production- conforming SF50 Vision Jet in early 2014.
Cirrus Logic Beats on Both Top and Bottom Lines.
Cirrus Logic is on Sale.
OSHKOSH – A new patented digital Fuel Level Sender from Redmond, Ore.-based CIES is now available on all new production Cirrus SR22T, SR22 and SR20 aircraft.
Chrysler designers left the boxy K-car '80s-think behind when they penned the striking, cab-forward Cirrus.
Peavey Cirrus Six-String Bass.
Peavey Cirrus Six- String Bass .

In science:

Similar values for the fractal dimension have been obtained for the more diffuse cirrus clouds (Dp = 1.3, Bazell & Desert 1988) and even for the atmospheric clouds on Earth (Dp = 1.35, Lovejoy 1982).
Cold Dark Clouds: The Initial Conditions for Star Formation
However, since Cas A lies close to the Galactic plane, foreground and background emission from intervening and background Galactic cirrus clouds — including molecular hydrogen, PAH emission, and weak low ionization emission lines — is present throughout the region.
Spitzer Spectral Mapping of Supernova Remnant Cassiopeia A
Very faint lines known to be associated primarily with Galactic cirrus emission, including rotational H2 S(0)–S(2) and PAH emission features, are omitted, as are the integrated flux measurement of the faintest ejecta lines, which would be dominated by systematic errors.
Spitzer Spectral Mapping of Supernova Remnant Cassiopeia A
Conditions were not photometric, and the field was observed through thin cirrus.
The IRAC Dark Field; Far- Infrared to X-ray Data
During this campaign only the central 5′ × 5′ of the IRAC cal field (the subregion with the deepest overall IRAC integration), was observed, and only at J-band. A total of 257 70 s dithered exposures were acquired through variable cirrus with sub-arcsecond seeing for a total combined exposure time of 5 hours.
The IRAC Dark Field; Far- Infrared to X-ray Data
Some sudden abnormal variations, where they exist, mostly come from the cirrus clouds in the sky.
Testing and Data Reduction of the Chinese Small Telescope Array (CSTAR) for Dome A, Antarctica
Both the [C I] lines and the cirrus-subtracted IR continuum are expected to originate in PDRs.
Mid-J CO Emission From NGC 891: Microturbulent Molecular Shocks in Normal Star Forming Galaxies
As before, we also take into account that probably only 50% of the IR continuum might arise from PDRs (with the rest originating from cirrus) and that the [O I] 63 µm line is optically thick.
Mid-J CO Emission From NGC 891: Microturbulent Molecular Shocks in Normal Star Forming Galaxies
About 50% of the infrared continuum likely originates from cirrus clouds in NGC 891.
Mid-J CO Emission From NGC 891: Microturbulent Molecular Shocks in Normal Star Forming Galaxies
The value of the observed/converted IR intensity is not corrected for the cirrus emission, yet.
Mid-J CO Emission From NGC 891: Microturbulent Molecular Shocks in Normal Star Forming Galaxies
This diffuse emission is analogous to the “infrared cirrus” emission observed in our own Galaxy.
Star Formation in the Milky Way and Nearby Galaxies
Fortunately, for most galaxies with moderate to high specific SFRs, the effects of partial dust attenuation and cirrus dust heating by evolved stars appear to roughly compensate for each other.
Star Formation in the Milky Way and Nearby Galaxies
In most cases, η < 1, because only part of the dustheating radiation is contained in the FUV band, and in many galaxies there is significant dust heating and TIR emission arising from stars other than the UV-emitting population (IR cirrus).
Star Formation in the Milky Way and Nearby Galaxies
Note the excellent spatial resolution despite the longer wavelengths, and the progressive increase in contributions from diffuse dust emission (“cirrus”) with increasing wavelength.
Star Formation in the Milky Way and Nearby Galaxies
After correcting for orbital background and zodiacal light, and after accounting for scattered Galactic light by ISM cirrus clouds (from the IRAS 100 µm emission), the extrapolated UV-to-FIR correlation to negligible FIR emission indicates [eUVB]≈200±100 c.u.
Ultraviolet Sky Surveys