cilium

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Definition
  1. Noun:
    • A short, curved hair growing from the edge of an eyelid: A cilium is one of the small hairs that form a fringe along the eyelid to protect the eye.
    • A microscopic, hairlike projection from the surface of a cell: In biology, a cilium is a slender protuberance that can beat rhythmically, providing movement for a cell or moving fluid over a cell's surface.
Examples of Usage

  • Noun (Eyelash):

    • A single cilium became loose and fell onto her cheek.
    • The doctor examined the inflammation at the base of the cilium.

  • Noun (Cell Biology):

    • The paramecium moves by the coordinated beating of its cilia.
    • Cilia lining the respiratory tract help to move mucus out of the lungs.
Advanced Usage

  • "Motile cilium": A type of cilium that moves actively, often used for locomotion or to move substances.

    • Sperm cells use a single, long motile cilium called a flagellum for swimming.

  • "Primary cilium": A non-motile sensory cilium found on most vertebrate cells, acting as a cellular antenna.

    • The primary cilium is crucial for detecting chemical signals in the environment.
Variants and Related Words

  • Ciliary (adj): Relating to or involving cilia.

    • The ciliary muscle controls the shape of the lens in the eye.

  • Ciliate (n/adj): (n) A single-celled organism that moves using cilia. (adj) Having cilia.

    • Paramecium is a well-known ciliate.
Synonyms
  • Eyelash: Specifically for the anatomical meaning.
  • Lash: Informal term for an eyelash.
  • Flagellum: A similar, longer, whiplike cellular structure used for movement (related but distinct term).
Related Phrases

(Note: "Cilium" is a technical/scientific noun and does not form standard phrasal verbs or idioms in everyday English.)

  • Ciliary beating: The rhythmic motion of cilia.

    • Ciliary beating frequency can be measured under a microscope.

  • Ciliary dysfunction: A failure of cilia to function correctly, which can cause diseases.

    • Primary ciliary dyskinesia is a genetic disorder of ciliary dysfunction.
Noun
  1. any of the short curved hairs that grow from the edges of the eyelids
  2. a hairlike projection from the surface of a cell; provides locomotion in free-swimming unicellular organisms

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