Definition of subarachnoid
: of, relating to, occurring, or situated under the arachnoid membrane subarachnoid hemorrhage
First Known Use of subarachnoid
Medical Definition of subarachnoid
1: situated or occurring under the arachnoid membrane subarachnoid hemorrhage
2: of, relating to, or involving the subarachnoid space and the fluid within it subarachnoid meningitis
Seen and Heard
What made you want to look up subarachnoid? Please tell us where you read or heard it (including the quote, if possible).