One of the mysteries of the English language finally explained.
1often sinusesZoology Anatomy
A cavity within a bone or other tissue, especially one in the bones of the face or skull connecting with the nasal cavities.
space, chamber, hollow, hole, pocket, pouchView synonyms
- ‘The two cavernous sinuses are large veins lying within the skull cavity, immediately behind each eye socket and on either side of the pituitary gland.’
- ‘During a physical examination, your doctor may feel for tenderness in the area of the sinuses and examine your nasal passages looking for inflammation, secretions or deformities.’
- ‘Common wood dust produced in sanding furniture and cabinets is associated with increases in cancer of the nasal cavities and sinuses.’
- ‘Your sinuses are hollow spaces within the bones of your face, behind and above your nose.’
- ‘The sheep's nasal cavity and sinuses are orientated in a similar fashion to man's.’
- 1.1 An irregular venous or lymphatic cavity, reservoir, or dilated vessel.
- 1.2Medicine An infected tract leading from a deep-seated infection and discharging pus to the surface.
- ‘The paranasal sinuses are a common infection site in children and adolescents.’
- ‘Asthma, allergies, or a chronic infection in the sinuses or breathing passages might also be responsible for long-term coughs.’
- ‘Sinusitis is when the sinuses get infected or irritated and cannot drain mucus as well as they should.’
- ‘When the linings of your sinuses become infected, usually due to viruses or bacteria, they may swell, causing an obstruction and interfering with the normal drainage of mucus.’
- ‘Pneumonia, bronchitis, and sinus and ear infections are three examples of complications from flu.’
- 1.3Botany A rounded notch between two lobes on the margin of a leaf or petal.
as modifier Relating to or denoting the sino-atrial node of the heart or its function of regulating the heartbeat.‘sinus rhythm’‘sinus tachycardia’
- ‘Although this medicine has been used to treat heart failure for more than 200 years, its role in patients with congestive heart failure and sinus rhythm is still debatable.’
- ‘Electrodes positioned at various sites in the heart can give only limited data about intracardiac conduction during sinus rhythm at rest.’
- ‘Sinus dysrhythmia refers to a malfunction of the sinus node, the heart's natural pacemaker.’
- ‘A normal heart rhythm is one in which each heartbeat originates in the sinus node and proceeds normally through the rest of the body's electric conduction system.’
- ‘The sinus node can increase your heart rate during times of high demand, such as during exercise.’
Late Middle English (in the medical sense): from Latin, literally ‘a recess, bend’.
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