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
Coverdale was touring with Whitesnake as recently as 2022, but a sinus infection prevented him from continuing.
—
Jon Blistein, Rolling Stone, 21 Nov. 2025
In the ensuing years Coverdale bounced between more solo work and a series of reunions with Whitesnake until a sinus infection in 2022 stopped him from touring with the group.
—Gil Kaufman, Billboard, 21 Nov. 2025
For short-term comfort, a warm compress over the sinuses or topical remedies like Vicks VapoRub may soothe symptoms, as its vapors stimulate nasal receptors.
—Daryl Austin, USA Today, 19 Nov. 2025
According to the Mayo Clinic, humidifiers can help with a number of winter woes, including dry sinuses, bloody noses, cracked lips, dry skin, and breathing problems.
—Meghan Overdeep, Southern Living, 17 Nov. 2025
See All Example Sentences for sinus
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Jon Blistein, Rolling Stone, 21 Nov. 2025
In the ensuing years Coverdale bounced between more solo work and a series of reunions with Whitesnake until a sinus infection in 2022 stopped him from touring with the group.
—Gil Kaufman, Billboard, 21 Nov. 2025
For short-term comfort, a warm compress over the sinuses or topical remedies like Vicks VapoRub may soothe symptoms, as its vapors stimulate nasal receptors.
—Daryl Austin, USA Today, 19 Nov. 2025
According to the Mayo Clinic, humidifiers can help with a number of winter woes, including dry sinuses, bloody noses, cracked lips, dry skin, and breathing problems.
—Meghan Overdeep, Southern Living, 17 Nov. 2025
See All Example Sentences for sinus
Cite this Entry
“Sinus.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/sinus. Accessed 27 Nov. 2025.
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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