What does sinus mean?

Definitions for sinus
ˈsaɪ nəssi·nus

This dictionary definitions page includes all the possible meanings, example usage and translations of the word sinus.

Princeton's WordNet

  1. fistula, sinusnoun

    an abnormal passage leading from a suppurating cavity to the body surface

  2. sinusnoun

    any of various air-filled cavities especially in the bones of the skull

  3. venous sinus, sinusnoun

    a wide channel containing blood; does not have the coating of an ordinary blood vessel


  1. sinusnoun

    A pouch or cavity in any organ or tissue, especially the paranasal sinus.

  2. sinusnoun

    An abnormal cavity or passage such as a fistula, caused by the destruction of tissue.

  3. Etymology: From sinus.

Samuel Johnson's Dictionary

  1. SINUSnoun

    Etymology: Latin.

    Plato supposeth his Atlantis to have sunk all into the sea: whether that be true or no, I do not think it impossible that some arms of the sea, or sinus’s, might have had such an original. Thomas Burnet, Theory of the Earth.


  1. sinus

    In medicine, a sinus refers to a cavity or hollow space within a body organ or tissue, often filled with air or fluid, such as the sinuses in the skull connecting to the nasal cavity. In mathematics, sinus or sine is a trigonometric function of an angle that represents the ratio of the length of the side that is opposite the angle to the length of the hypotenuse in a right-angled triangle. In anatomy, a sinus could also refer to a sac or cavity in any organ or tissue, or an abnormal cavity or passage caused by the destruction of tissue, typically ones caused by disease or injury.

Webster Dictionary

  1. Sinus

    of Sinus

  2. Sinusnoun

    an opening; a hollow; a bending

  3. Sinusnoun

    a bay of the sea; a recess in the shore

  4. Sinusnoun

    a cavity; a depression

  5. Sinusnoun

    a cavity in a bone or other part, either closed or with a narrow opening

  6. Sinusnoun

    a dilated vessel or canal

  7. Sinusnoun

    a narrow, elongated cavity, in which pus is collected; an elongated abscess with only a small orifice

  8. Sinusnoun

    a depression between adjoining lobes

  9. Etymology: [L., a bent surface, a curve, the folds or bosom of a garment, etc., a bay. Cf. Sine, n.]

Chambers 20th Century Dictionary

  1. Sinus

    sī′nus, n. a bending: a fold: an opening: a bay of the sea: a recess on the shore: (anat.) a cavity or hollow of bone or other tissue, one of the air-cavities contained in the interior of certain bones: a channel for transmitting venous blood: a narrow opening leading to an abscess, &c.—n. Sī′nusoid, the curve of sines in which the abscisses are proportional to an angle, and the ordinates to its sine.—adj. Sinusoi′dal.—adv. Sinusoi′dally. [L. sinus, a curve.]

Editors Contribution

  1. sinus

    A type of channel within the body of an animal or human being.

    My sister is delighted her sinus are so much better.

    Submitted by MaryC on January 29, 2020  


  1. Sinus

    a curvilinear indentation more or less profound: an excavation as if scooped out: a curved break in an otherwise straight margin.

Matched Categories

Anagrams for sinus »

  1. nisus

  2. Sunis

How to pronounce sinus?

How to say sinus in sign language?


  1. Chaldean Numerology

    The numerical value of sinus in Chaldean Numerology is: 9

  2. Pythagorean Numerology

    The numerical value of sinus in Pythagorean Numerology is: 1

Examples of sinus in a Sentence

  1. Holly Phillips:

    When you lie on your back, mucus collects in your sinus cavities, which can lead to secondary infections or chronic sinusitis.

  2. Cliodna McNulty:

    Most coughs, colds, sore throats, flu and sinus infections are self-limiting and will get better on their own. Antibiotics only improve symptoms by about 8-12 hours.

  3. Damon Thibodeaux:

    As we were talking, I was like,' Man, it sounds like you're congested,' and he said that he wasn't feeling good and he was exhausted. He thought that he was getting a sinus infection.

  4. Kaley Cuoco:

    I had sinus surgery the day after Christmas and it has been the worst surgery of my life. Very painful, and on top of it everyone of course thought I got a nose job. Which is so funny because if you know me I would have told you I got a nose job I’m not gonna keep it a secret.

  5. Pina LoGiudice:

    Studies show that the more sleep you get, the better your immune system will be, i would also recommend a small dose of vitamin C when a woman has a cold. You don’t want to take too much of it because it can induce contractions, so I usually keep it at anywhere less than 500 mg. I love Neti pots, especially if there is a sinus infection. And doing saltwater gargles if you have a sore throat.

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Translations for sinus

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"sinus." Definitions.net. STANDS4 LLC, 2024. Web. 17 Apr. 2024. <https://www.definitions.net/definition/sinus>.

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    the act of making a noisy disturbance
    A affront
    B rumpus
    C summon
    D abduct

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