sinus

[sahy-nuhs]

noun

plural

sinuses 

1. a curve; bend.

2. a curving part or recess.

3. Anatomy.

   1. any of various cavities, recesses, or passages, as a hollow in a bone, or a reservoir or channel for venous blood.

   2. one of the hollow cavities in the skull connecting with the nasal cavities.

   3. an expanded area in a canal or tube.

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

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

sinus

/ ˈsaɪnəs /

noun

1. anatomy

   1. any bodily cavity or hollow space

   2. a large channel for venous blood, esp between the brain and the skull

   3. any of the air cavities in the cranial bones

2. pathol a passage leading to a cavity containing pus

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

4. an irregularly shaped cavity

sinus

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

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

Other Word Forms

• sinuslike adjective

Word History and Origins

Origin of sinus¹

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

Word History and Origins

Origin of sinus¹

C16: from Latin: a curve, bay

Example Sentences

Ohtani’s symptoms have included chest and sinus “stuff” as well as “a deep cough,” Roberts added.

From Los Angeles Times

The contestants deal with rough seas, strong currents, jellyfish and sundry venomous creatures, intruding fishermen, limited air, sinus crises, variable visibility and unexpected orcas.

From Los Angeles Times

Though the most pressing health concern is protecting our lungs from smoke and ash, wildfires can also affect and irritate our sinuses, skin and eyes.

From Los Angeles Times

Many of these types of tumour would have previously been considered inoperable because of where they are situated in an area called the cavernous sinus.

From BBC

"I had a lot of problems with my sinuses when I was younger, so I breathe a lot through my mouth," said Draper.

From BBC