Dictionary > Cirrus

Cirrus

Definition
noun, plural: cirri
(botany) A tendril or clasper or similar part.
(zoology)
(1) A bundle or tuft of cilia serving as foot or tentacle in certain ciliate protozoa.
(2) An eversible copulatory organ of male flatworms and other invertebrates.
(3) A protuberance in the upper lip where the nasolabial groove terminates in a salamander head.
(4) The hair of certain animals (e.g. dog, horse) that is coarse and longer than the normal coat yet less coarse than tactile hairs.
(meteorology) A type of cloud characterized by thin, wisplike strands, often accompanied by tufts, thus, commonly referred to as ‘’mare’s tail’’.
Supplement
In salamanders the cirri are more prominent among males, and are believed to be involved in courtship.
In flatworms, the cirrus is an eversible copulatory apparatus. If it is not eversible, then it is called a penis.
Word origin: Latin, a curl, tuft, plant filament like a tuft of hair.

Related forms: cirrous (adjective)
Related terms:

  • cirrus capitis
  • cirrus caudae


You will also like...

Population Growth and Survivorship
Population Growth and Survivorship

This lesson looks at population attributes, regulation, and growth. It also covers population genetics, particularly gen..

Cambial cells
Plant Tissues

Plant organs are comprised of tissues working together for a common function. The different types of plant tissues are m..

Still Water Community Plants
Still Water Community Plants

This tutorial looks at the adaptations of freshwater plants for them to thrive in still water habitats. Familiarize your..

New Zealand - Biodiversity fauna
New Zealand’s Biodiversity

Find out more about New Zealand's unique biodiversity by exploring a range of different ecosystems and the key role of s..

Muscle
Muscle

Muscle cells are specialized to generate force and movement. Learn about the different types of muscle tissues in this t..

Geological Periods
Geological Periods

Geological periods is a study guide that cites the different geological periods on Earth's timeline. Each has a brief ov..

Related Articles...

No related articles found

See all Related Topics