Taber's Medical Dictionary
sinus
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(sī′nŭs)
pl. sinusessinus [L., sinus, curve, hollow]
1. A recess.
2. A cavity with a narrow opening.
3. An endothelium-lined, air-filled cavity within a bone. When lay people speak of sinuses, they usually mean the paranasal sinuses.
4. An endothelium-lined channel for venous blood.
5. A channel leading to an abscess.
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(sī′nŭs)
pl. sinusessinus [L., sinus, curve, hollow]
1. A recess.
2. A cavity with a narrow opening.
3. An endothelium-lined, air-filled cavity within a bone. When lay people speak of sinuses, they usually mean the paranasal sinuses.
4. An endothelium-lined channel for venous blood.
5. A channel leading to an abscess.
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