sinus

[ sahy-nuhs ]

/ ˈsaɪ nəs /

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noun, plural si·nus·es.

a curve; bend.

a curving part or recess.

Anatomy.

any of various cavities, recesses, or passages, as a hollow in a bone, or a reservoir or channel for venous blood.
one of the hollow cavities in the skull connecting with the nasal cavities.
an expanded area in a canal or tube.

Pathology. a narrow passage leading to an abscess or the like.

Botany. a small, rounded depression between two projecting lobes, as of a leaf.

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Origin of sinus

1590–1600; <Latin sinus (stem sinu-) bent or curved surface, curve, fold

OTHER WORDS FROM sinus

si·nus·like, adjective

Words nearby sinus

sinuation, Sinuiju, sinumbra lamp, sinuosity, sinuous, sinus, sinus arrest, sinus arrhythmia, sinus block, sinus histiocytosis with massive lymphadenopathy, Sinus Iridum

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2022

How to use sinus in a sentence

About two-thirds of people who develop the syndrome experience symptoms several days or weeks after they have fallen ill with diarrhea or a lung or sinus illness.
FDA adds new warning on Johnson & Johnson vaccine related to rare autoimmune disorder|Laurie McGinley, Lena H. Sun|July 12, 2021|Washington Post
One man had developed brain sinus clots during the shot’s clinical trial and a seventh case is under investigation, the pharmaceutical company said during the meeting.
People with rare blood clots after a COVID-19 jab share an uncommon immune response|Erin Garcia de Jesús|April 16, 2021|Science News
An independent safety review of the new data revealed no connection to blood clots and reported no cases of sinus clots, the company said in the March 22 statement.
AstraZeneca says its COVID-19 vaccine is 79 percent effective in a U.S. trial|Erin Garcia de Jesús|March 22, 2021|Science News
Eighteen patients who received the vaccine developed blood clots in the sinuses that drain blood from the brain, a potentially deadly condition called cerebral venous sinus thrombosis.
AstraZeneca’s COVID-19 vaccine isn’t tied to blood clots, experts say|Erin Garcia de Jesus|March 18, 2021|Science News

Otherwise, besides the dual assault of pollen and dryness on our sinuses, things are good.
PM Update: Record warmth of today tapers somewhat Friday|Ian Livingston|March 11, 2021|Washington Post
A fair number explicitly ask for an antibiotic, to cover the possibility that it is “bronchitis” or a “sinus infection.”
Without Education, Antibiotic Resistance Will Be Our Greatest Health Crisis|Russell Saunders|December 19, 2014|DAILY BEAST
Benign secondary headaches include headaches associated with the cold, flu, or sinus infections.
How to Destroy Your Headaches|Dr. Anand Veeravagu, MD, Tej Azad|June 23, 2014|DAILY BEAST
First of all, migraines often are misdiagnosed as sinus headaches.
Why Everything from Frigid Temperatures to Lightning Can Induce Migraines|Caitlin Dickson|January 8, 2014|DAILY BEAST
One of the entries reads: “I spoke with a doctor for a long time about my sinus infections.”
To Dream a Dream: Georges Perec’s Night Visions|Lauren Elkin|December 26, 2013|DAILY BEAST
I suffered intense sinus flare-ups, headaches, high blood pressure, wheezes, and coughs.
My (Electronic) Cigarette Addiction|Eli Lake|January 31, 2013|DAILY BEAST
Sinus duo sunt maiores, vastque; alter is, qui S. Laurentij gurges; alter, qui Francius appellatur.
The Jesuit Relations and Allied Documents, Vol. II: Acadia, 1612-1614|Various
Dr Klein's account of the origin of the sinus terminalis is quite correct.
The Works of Francis Maitland Balfour, Volume 1|Francis Maitland Balfour
From the first the sinus terminalis possesses cellular walls, as is clear from its mode of origin.
The Works of Francis Maitland Balfour, Volume 1|Francis Maitland Balfour
Cory and Kelly, sixty-eight ounces of blood was removed from the sinus, by aspiration.
Report on Surgery to the Santa Clara County Medical Society|Joseph Bradford Cox
The fluid in the sinus has increased gradually since the evacuation of it with the aspirator.
Report on Surgery to the Santa Clara County Medical Society|Joseph Bradford Cox

British Dictionary definitions for sinus

sinus

/ (ˈsaɪnəs) /

noun plural -nuses

anatomy

any bodily cavity or hollow space
a large channel for venous blood, esp between the brain and the skull
any of the air cavities in the cranial bones

pathol a passage leading to a cavity containing pus

botany a small rounded notch between two lobes of a leaf, petal, etc

an irregularly shaped cavity

Word Origin for sinus

C16: from Latin: a curve, bay

Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Medical definitions for sinus

sinus

[ sī′nəs ]

A depression or cavity formed by a bending or curving.

A channel for the passage of blood or lymph, without the coats of an ordinary vessel, such as the blood passages in the gravid uterus or in the cerebral meninges.

Any of various air-filled cavities in the bones of the skull, especially one communicating with the nostrils.

A dilatation in a blood vessel.

A fistula or tract leading to a pus-filled cavity.

Scientific definitions for sinus

sinus

[ sī′nəs ]

A cavity or hollow space in a bone of the skull, especially one that connects with the nose.

A channel for the passage of a body fluid, such as blood.

sinus

Origin of sinus

OTHER WORDS FROM sinus

Words nearby sinus

Words related to sinus

How to use sinus in a sentence

British Dictionary definitions for sinus

Word Origin for sinus

Medical definitions for sinus

Scientific definitions for sinus