sinus
Stuart Judge
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"sinus." The Oxford Companion to the Body. . Encyclopedia.com. 22 Feb. 2019 <https://www.encyclopedia.com>.
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sinus
si·nus / ˈsīnəs/ • n. 1. (often sinuses) Anat. & Zool. a cavity within a bone or other tissue, esp. one in the bones of the face or skull connecting with the nasal cavities. ∎ an irregular venous or lymphatic cavity, reservoir, or dilated vessel. ∎ Med. an infected tract leading from a deep-seated infection and discharging pus to the surface. ∎ Bot. a rounded notch between two lobes on the margin of a leaf or petal. 2. [as adj.] Physiol. relating to or denoting the sinoatrial node of the heart or its function as a pacemaker: sinus rhythm sinus tachycardia.
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sinus
1. an air cavity within a bone, especially any of the cavities within the bones of the face or skull (see paranasal sinuses).
2. any wide channel containing blood, usually venous blood. s. arrhythmia see arrhythmia. s. rhythm a normal heart rhythm, usually as recorded on an electrocardiogram. s. venosus a chamber in the embryonic heart that becomes part of the right atrium after birth.
3. a pocket or bulge in a tubular organ, especially a blood vessel.
4. (sinus tract) a blind-ending infected tract leading from a focus of infection to the surface of the skin or a hollow organ. See pilonidal sinus.
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"sinus." A Dictionary of Nursing. . Encyclopedia.com. 22 Feb. 2019 <https://www.encyclopedia.com>.
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sinus
sinus, cavity or hollow space in the body, usually filled with air or blood. In humans the paranasal sinuses, mucus-lined cavities in the bones of the face, are connected by passageways to the nose and probably help to warm and moisten inhaled air. When drainage from them is blocked, as after a cold, these sinuses often become infected, a condition called sinusitis. The accumulation of pus results in pressure, headaches, pain, and general discomfort. In invertebrates one of the spaces among the muscles and viscera through which blood returns to the heart is also known as a sinus.
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sinus
1. The word ‘sinus’ was used by Giovanni B. Riccioli in 1651 to designate bay-like features on the lunar maria (see MARE). The best known example is Sinus Iridum, the ‘Bay of Rainbows’, on the north-western margin of the ‘Sea of Rains’ (Mare Imbrium).
2. In certain bivalves (Bivalvia), a recess or embayment in the pallial line; most bivalves with a pallial sinus are burrowers.
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"sinus." A Dictionary of Earth Sciences. . Encyclopedia.com. 22 Feb. 2019 <https://www.encyclopedia.com>.
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sinus
1. A space, found e.g. in certain bones of the face of a mammal where they are filled with air and connect with the nasal cavity.
2. In certain Bivalvia, a recess or embayment in the pallial line; forms with a sinus are generally burrowers.
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sinus
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