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cirrus.

Synonym of tendril (“a thin, spirally coiling stem that attaches a plant to its support”).

6 characters2 syllables approx.English language

Meaning & usage

noun/ˈsɪɹəs/General-American, Received-Pronunciation/ˈsɪɹaɪ/General-American, Received-Pronunciation
  1. Synonym of tendril (“a thin, spirally coiling stem that attaches a plant to its support”).

  2. A thin tendril-like appendage, such as a barbel (“whisker-like sensory organ around the mouth”) of some fish, a cilium of some species of protists, or a foot of some crustaceans of the infraclass Cirripedia.

  3. A tuft of ornamental feathers.

    obsolete
  4. A long, thin, wirelike tail feather.

    obsolete
  5. A principal high-level type of cloud, typically composed of thin, delicate, white filaments or wisps, or narrow bands.

    attributive · often
Where this word comes from

Learned borrowing from Latin cirrus (“curl; fringe of clothes; mane (especially forelock) of a horse; etc”); further etymology unknown. Sense 2 (“type of cloud”) was coined by the British chemist and amateur meteorologist Luke Howard (1772–1864): see the 1803 quotation. The plural form cirri is also a learned borrowing from Latin cirrī, the nominative or vocative plural of cirrus.

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Definitions, grammatical labels, IPA, etymology and examples: Wiktionary contributors, extracted by Kaikki / Wiktextract. Adapted under CC BY-SA 4.0. Selected fields and authored examples are shown; third-party quotations and audio are omitted. See contributor history.

Last enriched 2026-09-10. Definitions are in English. Romanizations are shown when supplied by the source; syllable estimates are omitted for unsupported scripts.