sinus is a topic covered in the Taber's Medical Dictionary.

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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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Citation

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TY - ELEC T1 - sinus ID - 729821 Y1 - 2017 PB - Taber's Medical Dictionary UR - https://www.tabers.com/tabersonline/view/Tabers-Dictionary/729821/all/sinus ER -