a
: a narrow elongated tract extending from a focus of suppuration and serving for the discharge of pus
b(1)
: a cavity in the substance of a bone of the skull that usually communicates with the nostrils and contains air
(2)
: a channel for venous blood
(3)
: a dilatation in a bodily canal or vessel
c
: a cleft or indentation between adjoining lobes (as of a leaf or corolla)
Examples of sinus in a Sentence
Recent Examples on the Web
For some travelers, such as babies and young children, and anyone with sinus problems, a little extra vigilance and measures may be required.
—
Blane Bachelor, Condé Nast Traveler, 9 Apr. 2024
Gabriel tried to distract himself with the tactile sensations of farming: wet dirt stiffening his hands and massing under his nails; cold creeping through his jeans and long underwear; humidity swelling through his sinuses.
—Lily Meyer, The Atlantic, 25 Mar. 2024
Based on the background incidence of the condition, 66 cases were expected — but 190 events were observed.
ChAdOx1 was linked to a threefold increase in cerebral venous sinus thrombosis, a type of blood clot in the brain, identified in 69 events, compared with an expected 21.
—Jason Gale, Fortune Well, 19 Feb. 2024
The bullet passed through her sinus cavity, shattered her jaw and injured a paw.
—Letters To The Editor, The Mercury News, 26 Jan. 2024
No Drip Severe Congestion spray with menthol for instant nasal and sinus congestion relief.
—Nora Colomer, Fox News, 18 Mar. 2024
Neti pots are commonly used to flush the nasal passages, helping to alleviate allergy symptoms or clear mucus during a sinus infection.
—Cara Lynn Shultz, Peoplemag, 14 Mar. 2024
That’s why Vicks Cool Mist Humidifier is a go-to for people suffering from bad sinuses.
—Amari Pollard, Verywell Health, 12 Mar. 2024
Some people with the condition develop skin tunnels, also known as sinus tracts, which can open up, leak fluid, and cause scars.
—Tatiana Walk-Morris, SELF, 26 Feb. 2024
Blane Bachelor, Condé Nast Traveler, 9 Apr. 2024
Gabriel tried to distract himself with the tactile sensations of farming: wet dirt stiffening his hands and massing under his nails; cold creeping through his jeans and long underwear; humidity swelling through his sinuses.
—Lily Meyer, The Atlantic, 25 Mar. 2024
Based on the background incidence of the condition, 66 cases were expected — but 190 events were observed.
ChAdOx1 was linked to a threefold increase in cerebral venous sinus thrombosis, a type of blood clot in the brain, identified in 69 events, compared with an expected 21.
—Jason Gale, Fortune Well, 19 Feb. 2024
The bullet passed through her sinus cavity, shattered her jaw and injured a paw.
—Letters To The Editor, The Mercury News, 26 Jan. 2024
No Drip Severe Congestion spray with menthol for instant nasal and sinus congestion relief.
—Nora Colomer, Fox News, 18 Mar. 2024
Neti pots are commonly used to flush the nasal passages, helping to alleviate allergy symptoms or clear mucus during a sinus infection.
—Cara Lynn Shultz, Peoplemag, 14 Mar. 2024
That’s why Vicks Cool Mist Humidifier is a go-to for people suffering from bad sinuses.
—Amari Pollard, Verywell Health, 12 Mar. 2024
Some people with the condition develop skin tunnels, also known as sinus tracts, which can open up, leak fluid, and cause scars.
—Tatiana Walk-Morris, SELF, 26 Feb. 2024
These examples are programmatically compiled from various online sources to illustrate current usage of the word 'sinus.' Any opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback about these examples.
Dictionary Entries Near sinus
Cite this Entry
“Sinus.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/sinus. Accessed 1 May. 2024.
Copy CitationKids Definition
Medical Definition
sinus
noun
si·nus
ˈsī-nəs 
: a cavity or hollow in the body: as
a
: a narrow elongated tract extending from a focus of suppuration and serving for the discharge of pus
a tuberculous sinus
b(1)
: a cavity in the substance of a bone of the skull that usually communicates with the nostrils and contains air
(2)
: a channel for venous blood
(3)
: a dilatation in a bodily canal or vessel
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