sinuses

/S AY1 N AH0 S AH0 Z/

noun

1
A pouch or cavity in any organ or tissue, especially the paranasal sinus.
2
A channel for transmitting venous blood.
3
A notch or depression between two lobes or teeth in the margin of an organ.
4
An abnormal cavity or passage such as a fistula, caused by the destruction of tissue.
5
A bay of the sea; a recess in the shore.

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