Definition

1. Noun:
   • A sinus of the meatuses of the nasal cavity (behind the bridge of the nose): The ethmoidal sinus refers to one of the small, air-filled cavities located within the ethmoid bone, a delicate bone situated between the eyes and behind the nasal bridge. These sinuses are part of the paranasal sinus system.

Usage Examples

• Noun:
  • Chronic inflammation can affect the ethmoidal sinus.
  • The CT scan revealed a polyp in the left ethmoidal sinus.
  • Surgery may be required to drain an infected ethmoidal sinus.

Advanced Usage

• Medical Context: The term is primarily used in medical, anatomical, and clinical discussions.
  • The surgeon carefully navigated the endoscopic instruments toward the posterior ethmoidal sinus.

Variants and Related Words

• Ethmoid sinus (n): A common alternative term for ethmoidal sinus.
• Ethmoidal air cells (n): A more specific term often used to describe the collection of small, interconnected cavities that constitute the ethmoidal sinus complex.
• Sinus ethmoidalis (n): The Latin anatomical term.

Synonyms

• Ethmoid cell: A synonym emphasizing the small, compartmentalized nature of these sinuses.
• Ethmoidal air cell: As above.

Related Terms (Not Phrasal Verbs or Idioms)

• Paranasal sinus: The general category of sinuses near the nose, which includes the ethmoidal, maxillary, frontal, and sphenoidal sinuses.
• Ethmoid bone: The bone in which the ethmoidal sinuses are located.
• Sinusitis: Inflammation of the sinuses, which can involve the ethmoidal sinus.

Noun

1. a sinus of the meatuses of the nasal cavity (behind the bridge of the nose)