(Latin: curve, curving; winding; turning; hollow)
2. Relating to being full of bends and turns: The visitors saw the sinuous course of a stream and so they walked along the side for a long time.
3. Conveying that which is indirect or devious.
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The sphenoid and ethmoid sinuses are deeper in the skull behind the eyes and maxillary sinuses.
The sinuses are lined by mucous-secreting cells. Air enters the sinuses through small opening in bone called ostia. If an ostium is blocked, air cannot pass into the sinus and also the mucous cannot drain out.2. A channel permitting the passage of blood or lymph fluid that is not a blood or lymphatic vessel; such as, the sinuses of the placenta.
3. Etymology: "abscess, sore", from Middle Latin sinus, from Latin sinus, "bend, fold, curve".
2. Any of the venous cavities through which blood passes in various glands and organs; such as, the adrenal gland and the liver.