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    si·nus
    [ˈsīnəs]
    noun
    sinus (noun) · sinuses (plural noun)
    1. anatomy
      zoology
      (sinuses)
      a cavity within a bone or other tissue, especially one in the bones of the face or skull connecting with the nasal cavities.
      • an irregular venous or lymphatic cavity, reservoir, or dilated vessel.
      • medicine
        an infected tract leading from a deep-seated infection and discharging pus to the surface.
      • botany
        a rounded notch between two lobes on the margin of a leaf or petal.
    2. physiology
      relating to or denoting the sinoatrial node of the heart or its function as a pacemaker:
      "sinus rhythm" · "sinus tachycardia"
    Origin
    late Middle English (in the medical sense): from Latin, literally ‘a recess, bend’.
    Translate sinus to
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    Similar and Opposite Words
    noun
    1. a cavity within a bone or other tissue, especially one in the bones of the face or skull connecting with the nasal cavities.
      space
      chamber
      hollow
      hole
      pocket
      pouch
      orifice
      aperture
      socket
      gap
      crater
      pit
      cutting
      concavity
      lacuna
      sac
      alveolus
      ampulla
      antrum
      archenteron
      bulla
      bursa
      lumen
      orbit
      ventricle
      vesicle
      calyx
      cyst
      geode
      vug

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    2. People also ask
      What does sinus mean?Get a quick, free translation! SINUS definition: 1. any of the spaces inside the head that are connected to the back of the nose 2. a space or…. Learn more.

      SINUS | English meaning - Cambridge Dictionary

      dictionary.cambridge.org
      What should you know about sinusitis?
      primaryExpertImage

      Dr. Ramamurthy Bangalore

      M.D., F.C.C.P., F.A.C.P., F.A.A.S.M. (Pulmonologist) · 30 years of exp

      Sinusitis is an inflammatory or swollen condition affecting the tissue that lines the sinuses. Sinuses are hollow spaces within the bones that run between the eyes, behind the cheekbones, and in the forehead. They produce mucus, which helps maintain the moisture level in the inside of your nose. This provides additional protection against dust, allergens, and pollutants.
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      3 more answers
      microsoftstart.msn.com
      What is a sinus in anatomy?A sinus is a sac or cavity in any organ or tissue, or an abnormal cavity or passage. In common usage, "sinus" usually refers to the paranasal sinuses, which are air cavities in the cranial bones, especially those near the nose and connecting to it. Most individuals have four paired cavities located in the cranial bone or skull.

      Sinus (anatomy) - Wikipedia

      en.wikipedia.org
      What is sinusitis?Sinus is Latin for "bay", "pocket", "curve", or "bosom". In anatomy, the term is used in various contexts. The word "sinusitis" is used to indicate that one or more of the membrane linings found in the sinus cavities has become inflamed or infected. It is however distinct from a fistula, which is a tract connecting two epithelial surfaces.

      Sinus (anatomy) - Wikipedia

      en.wikipedia.org
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    3. Merriam Webster
      https://www.merriam-webster.com/dictionary/sinus

      Sinus Definition & Meaning - Merriam-Webster

       
    4. Wikipedia
      https://en.wikipedia.org/wiki/Sinus_(anatomy)

      Sinus (anatomy) - Wikipedia

    5. Dictionary
      https://www.dictionary.com/browse/sinus

      SINUS Definition & Meaning | Dictionary.com

    6. Cleveland Clinic
      https://my.clevelandclinic.org/health/dis…

      Sinus Infection (Sinusitis): Causes, Symptoms

      WEBMar 9, 2023 · Sinusitis is an inflammation of the tissues in your sinuses, usually caused by viruses, bacteria, fungi or allergies. It can cause facial pain, a stuffy or runny nose, fever and other symptoms. Learn about the …

    7. Cambridge Dictionary
      https://dictionary.cambridge.org/dictionary/english/sinus

      SINUS | English meaning - Cambridge Dictionary

    9. Healthline
      https://www.healthline.com/human-body-maps/sinus-cavities

      Sinus Cavities in the Head: Anatomy, Diagram & Pictures

    10. Cambridge Dictionary
      https://dictionary.cambridge.org/us/dictionary/english/sinus

      SINUS | definition in the Cambridge English Dictionary

    11. Britannica
      https://www.britannica.com/science/sinus

      Sinus | Causes, Symptoms & Treatments | Britannica

    12. National Center for Biotechnology Information
      https://www.ncbi.nlm.nih.gov/books/NBK513272

      Anatomy, Head and Neck, Nose Sinuses - StatPearls

      WEBJul 24, 2023 · A sinus is defined as: A channel that is not a blood or lymphatic vessel that allows for the passage of blood or lymph, such as found in the placenta, sinuses, or the cerebral meninges. A cavity …

    13. Dictionary
      https://www.dictionary.com/browse/ sinus

      Sinus Definition & Meaning | Dictionary.com

    14. National Center for Biotechnology Information
      https://www.ncbi.nlm.nih.gov/books/NBK532926

      Anatomy, Head and Neck, Sinus Function and …

      WEBJan 30, 2023 · Introduction. The paranasal sinuses (the hollow spaces in the skull and facial bones around the nose) are air-filled cavities within the frontal, ethmoidal, sphenoidal, and maxillary bones. [1] . They …

    15. Collins Dictionary
      https://www.collinsdictionary.com/dictionary/english/sinus

      SINUS definition and meaning | Collins English Dictionary

    16. Oxford Learner's Dictionaries
      https://www.oxfordlearnersdictionaries.com/definition/english/sinus

      sinus noun - Definition, pictures, pronunciation and usage notes ...

    17. Medical Dictionary
      https://medical-dictionary.thefreedictionary.com/sinus

      Sinus | definition of sinus by Medical dictionary

    18. Cambridge Dictionary
      https://dictionary.cambridge.org/us/dictionary/learner-english/sinus

      sinus | definition in the Cambridge Learner’s Dictionary

    19. Mayo Clinic
      https://www.mayoclinic.org/diseases-conditions/chronic-sinusitis

      Chronic sinusitis - Symptoms and causes - Mayo Clinic

    20. Mayo Clinic
      https://www.mayoclinic.org/diseases-conditions/...

      Acute sinusitis - Symptoms and causes - Mayo Clinic

    21. TYLENOL®
      https://www.tylenol.com/symptoms/sinus/what-are-sinuses

      What Are Sinuses: Anatomy, Function and Common Conditions

    22. Britannica
      https://www.britannica.com/science/sine

      Sine | Definition, Formulas, & Facts | Britannica

    23. Vocabulary.com
      https://www.vocabulary.com/dictionary/sinus

      Sinus - Definition, Meaning & Synonyms | Vocabulary.com

    24. Merriam Webster
      https://www.merriam-webster.com/dictionary/sine

      Sine Definition & Meaning - Merriam-Webster

    25. Wikipedia
      https://en.wikipedia.org/wiki/Sinus

      Sinus - Wikipedia