1. (pl. cirri) In certain ciliate protozoa, an organelle, formed by the fusion of a group of cilia, which usually functions in locomotion.
What is the meaning of cirrus sac?
[′sir·əs ‚sak] (invertebrate zoology) A pouch or channel containing the copulatory organ (cirrus) in certain invertebrates.
What is a cirri microbiology?
In biology, a cirrus /ˈsɪrəs/ SIRR-əs, plural cirri, /ˈsɪraɪ/ SIRR-eye, (from the Latin cirrus meaning a curl-like tuft or fringe) is a long, thin structure in an animal similar to a tentacle but generally lacking the tentacle’s strength, flexibility, thickness, and sensitivity.
How are cirrus clouds made?
Cirrus clouds form from the ascent of dry air, making the small quantity of water vapour in the air undergo deposition into ice (to change from a gas directly into a solid). Cirrus is made up completely of ice crystals, which provides their white colour and form in a wide range of shapes and sizes.
What does Eversible mean?
capable of being everted.
What is the pronunciation of cirrus cloud?
noun, plural cir·rus for 1, cir·ri [sir-ahy] for 2, 3. Meteorology.
What is the altitude of cirrus?
Typically found at heights greater than 20,000 feet (6,000 meters), cirrus clouds are composed of ice crystals that originate from the freezing of supercooled water droplets. Cirrus generally occur in fair weather and point in the direction of air movement at their elevation.
How are cirrus clouds described?
Cirrus clouds are wispy, feathery, and composed entirely of ice crystals. They often are the first sign of an approaching warm front or upper-level jet streak. Unlike cirrus, cirrostratus clouds form more of a widespread, veil-like layer (similar to what stratus clouds do in low levels).
What do cirrus clouds predict?
Cirrus clouds are usually white and predict fair to pleasant weather. By watching the movement of cirrus clouds you can tell from which direction weather is approaching. When you see cirrus clouds, it usually indicates that a change in the weather will occur within 24 hours. … The clouds usually cover the entire sky.
What do you mean by Protrusible?
protrusible in British English
(prəˈtruːsɪbəl) adjective. able to be thrust outwards.
What is meant by Eversible Pharynx?
Eversible pharynx
Eversible pharynx: Pharynx can be everted to engulf and/or seize food items. Has Values: Eversible pharynx. Buccal organ absent or occluded.
What is Eversible Pharynx?
Eversible pharynx: Pharynx can be everted to engulf and/or seize food items. Show new concepts. Has Values: Eversible pharynx. Buccal organ absent or occluded.
What temperature do cirrus clouds form?
Cirrus are thin, whispy clouds composed of ice crystals that originate from the freezing of supercooled water droplets and exist where temperatures are below -38 degrees Celsius. Cirrus generally occur in fair weather and move from west to east, pointing in the direction of the prevailing winds at their elevation.
Do cirrus clouds mean rain?
Cirrus form very high in the atmosphere. … Only at very high altitudes or latitudes do Cirrus produce rain at ground level. But if you notice that Cirrus begins to cover more of the sky, and gets lower and thicker, this is a good indication that a warm front is approaching.
Are clouds made of ice?
All clouds are made up of basically the same thing: water droplets or ice crystals that float in the sky.
What kind of weather do cumulonimbus clouds bring?
Cumulonimbus clouds are associated with extreme weather such as heavy torrential downpours, hail storms, lightning and even tornadoes. Individual cumulonimbus cells will usually dissipate within an hour once showers start falling, making for short-lived, heavy rain.
What term best describes cirrus clouds?
Cirrus clouds are made of ice crystals and look like long, thin, wispy white streamers high in the sky. They are commonly known as “mare’s tails” because they are shaped like the tail of a horse. Cirrus clouds are often seen during fair weather.
What is rain clouds called?
The prefix “nimbo-” or the suffix “-nimbus” are low-level clouds that have their bases below 2,000 meters (6,500 feet) above the Earth. Clouds that produce rain and snow fall into this category. (“Nimbus” comes from the Latin word for “rain.”) Two examples are the nimbostratus or cumulonimbus clouds.
What is a word for wispy clouds?
Synonyms, crossword answers and other related words for WISPY CLOUD [cirrus]
What are nimbus clouds?
Nimbostratus clouds are dark, grey, featureless layers of cloud, thick enough to block out the Sun. Producing persistent rain, these clouds are often associated with frontal systems provided by mid-latitude cyclones.
How do you read the weather sky?
If it is rows of low, dark, lumpy clouds, then the weather is otherwise okay, but watch for further developments. If there is a low, dark, grey sheet, then it’s probably raining. If it’s not, quickly go get your umbrella. If your clouds are low, fluffy, and white like cottonballs in the sky, then the weather is okay.
What is the name of the clouds that bring cool dry weather?
In fact, stratus clouds can last for days and bring cool temperatures, persistent rain, drizzle, or even snow. Now on to my favorite type of cloud, cirrus clouds!
What do you mean by bifid?
Definition of bifid
: divided into two equal lobes or parts by a median cleft a bifid leaf.
What does Bilobed mean?
Definition of bilobed
: divided into two lobes a bilobed nucleus.
What is Protrusible proboscis?
Capable of being thrust outward, as the proboscis of many insects. adjective. Capable of being thrust outward, as the proboscis of many insects.
What is difference between larynx and pharynx?
The main difference between pharynx and larynx is that pharynx is a part of an alimentary canal, which extends from the nasal cavity and mouth to the larynx and the esophagus whereas larynx is the upper portion of the trachea. … The larynx is also called the vocal box since it contains vocal cords.
What is the area behind the uvula called?
The nasopharynx is the portion of the pharynx that is posterior to the nasal cavity and extends inferiorly to the uvula. The oropharynx is the portion of the pharynx that is posterior to the oral cavity.
What is the function of nasopharynx?
The nasopharynx functions as an airway in the respiratory system. Also contained within the nasopharynx are the adenoids, or pharyngeal tonsils. Image from Human Anatomy Atlas. The oropharynx is the middle portion of the pharynx, working with both the respiratory and digestive systems.
What is the composition of cirrus?
Cirrus clouds are composed of ice crystals that originate from the freezing of super cooled water droplets in regions where air temperature is lower than -20 °C or -30 °C. Cirrus usually occur in fair weather. They are formed when it is high enough to be cold and freeze the water drops into ice.
Are stratus clouds high or low?
Stratus clouds are low-level layers with a fairly uniform grey or white colour. Often the scene of dull, overcast days in its ‘nebulosus’ form, they can persist for long periods of time. They are the lowest-lying cloud type and sometimes appear at the surface in the form of mist or fog.
Do cirrus clouds form at low altitudes?
This is because they generally occur at higher temperatures and lower altitudes than cirrus and cirrostratus clouds. … However, there are many cirrocumulus clouds that do form at low temperatures (<−30 °C) and altitudes where cirrus and cirrostratus form in the high troposphere (Figure 5).