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sinus Definition

si·nus (sī′nəs)

noun

  1. a bend or curve
  2. any cavity or hollow formed by a bending or curving
  3. Anat., Zool. any of various cavities, hollows, or passages; esp.,
    1. any of the air cavities in the skull opening into the nasal cavities
    2. a large channel for venous blood
    3. a dilated part in a blood vessel, etc.
  4. Bot. a rounded depression between two consecutive lobes, as of a leaf
  5. Med. a channel leading from a pus-filled cavity

Etymology: L, a bend, curve, fold

sinus Usage Examples

Converse of object

  • drain: This is known as a draining sinus or abscess.
  • block: People may also have trouble breathing, have a runny nose, and blocked sinuses.
  • clear: If this maneuver does not clear the sinuses, they should ascend to a higher altitude.
  • have: They noted that from 100 samples, seven had either sinuses or epithelial lined spaces.
  • discharge: The resulting abscess then ruptures spontaneously leaving a painful discharging sinus.
  • involve: We present a case of NHL involving the left maxillary sinus in a patient with AIDS.

Adjective modifier

  • paranasal: The majority of these lesions arise in the oral cavity or paranasal sinuses.
  • pilonidal: A pilonidal sinus is a small hole or tunnel in the skin, usually at the very top of the cleft between the buttocks.
  • maxillary: Band saw used to remove the side of the cheek, to open the maxillary sinus.
  • sphenoid: Note also the blood in the sphenoid sinuses, consistent with a basal skull fracture.
  • cavernous: Thirteen patients had a surgical invasion of the cavernous sinus.
  • frontal: Also the right frontal sinus is larger than the left.

Modifies a noun

  • tachycardia: Upon hospitalization two hours after ingestion symptoms were sinus tachycardia, nausea and vomiting.
  • hypersensitivity: Conclusions Cardiac pacing significantly reduces falls in patients with carotid sinus hypersensitivity.
  • tarsus: Tenderness may be found in the sinus tarsi, especially with hindfoot abduction.
  • bradycardia: His vital signs were monitored and an ECG revealed a sinus bradycardia with the presence of J waves.
  • arrhythmia: The monitor works by measuring respiratory sinus arrhythmia ( RSA ).
  • mucosa: We are further evaluating the histology of sinus mucosa in health and disease.

Noun used with modifier

  • air: The maxillary sinuses, the largest of the paranasal air sinuses, open into the middle meatus through one, two or three openings.
  • maxillary: CASE: We report on a 25-year old female patient presenting with a bony mass in the right maxillary sinus.