Definition

1. Noun:
   • A nasal sinus is one of several air-filled cavities located within the bones of the face and skull, directly connected to the nasal cavity. These cavities are lined with a mucous membrane that is continuous with the lining of the nose.

Usage

• The term nasal sinus is used in medical and anatomical contexts to refer to these specific hollow spaces. It is often used in the plural form, nasal sinuses, as they typically occur in pairs.
• Nasal sinus functions as a noun phrase, typically serving as the subject or object of a sentence.

Examples

• Noun:
  • Inflammation of a nasal sinus can cause significant facial pain and pressure.
  • The doctor ordered a CT scan to examine the patient's nasal sinuses.
  • The function of the nasal sinuses includes humidifying inhaled air and lightening the weight of the skull.

Advanced Usage

• The phrase is frequently modified to specify a particular sinus, such as the frontal nasal sinus or the maxillary nasal sinus.
• In medical terminology, nasal sinus is synonymous with paranasal sinus, which emphasizes their location around () the nose ().

Variants and Related Words

• Paranasal sinus (n): A more precise anatomical term for a nasal sinus.
• Sinusitis (n): The medical condition referring to inflammation or infection of the nasal sinuses.
• Sinus (n): A more general term for any cavity or hollow space in the body; when used alone, it often contextually refers to a nasal sinus.

Synonyms

• Paranasal sinus
• Sinus cavity (when context is clear)

Related Phrases

• Sinus congestion: Blockage of the nasal sinuses.
• Sinus headache: A headache caused by pressure in the nasal sinuses.
• Sinus infection: A bacterial or viral infection of the nasal sinuses.

Noun

1. any of the paired sinuses in the bones of the face adjacent to the nasal cavity that are lined with mucous membrane that is continuous with the lining of the nasal cavities