of, relating to, or situated below the arachnoid membrane.
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How to use subarachnoid in a sentence
The brain was generally blood-red; in the cerebral hemispheres there were several large circumscribed subarachnoid extravasations.Poisons: Their Effects and Detection | Alexander Wynter Blyth
The blood may escape through the pia mater into the subarachnoid cavity, and large clots be formed.Special Report on Diseases of the Horse | United States Department of Agriculture