[ suhb-uh-rak-noid ]
/ ˌsʌb əˈræk nɔɪd /
of, relating to, or situated below the arachnoid membrane.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
Examples from the Web for subarachnoid
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