subarachnoid
adjective
sub·arach·noid
ˌsəb-ə-ˈrak-ˌnȯid 
variants
or less commonly subarachnoidal
: of, relating to, occurring, or situated under the arachnoid membrane
subarachnoid hemorrhage
Examples of subarachnoid in a Sentence
Recent Examples on the Web
When that bleeding happens, it’s called a subarachnoid hemorrhage.
—
Saleen Martin, USA TODAY, 18 Nov. 2024
This fluid circulates through the ventricles of the brain, the central canal of the spinal cord, and the subarachnoid space surrounding the brain and spinal cord.
—Danielle Wilhour, Discover Magazine, 15 Aug. 2024
This fluid circulates through the ventricles of the brain, the central canal of the spinal cord and the subarachnoid space surrounding the brain and spinal cord.
—Danielle Wilhour, The Conversation, 14 Aug. 2024
He was also diagnosed and treated for acute encephalopathy, Agitation, subdural hematoma, subdural hygroma, and subarachnoid hemorrhage during his 21-day stay, the lawsuit said.
—Kate Linderman, Kansas City Star, 19 July 2024
In 2011, Clarke experienced her first aneurysm, which caused a stroke and a subarachnoid hemorrhage, not long after wrapping up filming the first season of Game of Thrones.
—Becca Longmire, Peoplemag, 10 June 2024
This is most commonly caused by untreated high blood pressure, and the blood may spill into either the inside of the brain or the space between the brain and its subarachnoid covering.
—Matt Hrodey, Discover Magazine, 22 May 2023
Blood thinners, bleeding disorders, or head injuries may cause subarachnoid bleeding.
—Alyssa Hui, Health, 12 Apr. 2023
Moderate to severe TBIs can also include contusions, or bruising of the brain tissue; or hemorrhages—both intracerebral hemorrhages and subarachnoid hemorrhages—which is when active bleeding is present, according to the American Association of Neurological Surgeons (AANS).
—Ashley Abramson, Health.com, 14 Feb. 2022
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Saleen Martin, USA TODAY, 18 Nov. 2024
This fluid circulates through the ventricles of the brain, the central canal of the spinal cord, and the subarachnoid space surrounding the brain and spinal cord.
—Danielle Wilhour, Discover Magazine, 15 Aug. 2024
This fluid circulates through the ventricles of the brain, the central canal of the spinal cord and the subarachnoid space surrounding the brain and spinal cord.
—Danielle Wilhour, The Conversation, 14 Aug. 2024
He was also diagnosed and treated for acute encephalopathy, Agitation, subdural hematoma, subdural hygroma, and subarachnoid hemorrhage during his 21-day stay, the lawsuit said.
—Kate Linderman, Kansas City Star, 19 July 2024
In 2011, Clarke experienced her first aneurysm, which caused a stroke and a subarachnoid hemorrhage, not long after wrapping up filming the first season of Game of Thrones.
—Becca Longmire, Peoplemag, 10 June 2024
This is most commonly caused by untreated high blood pressure, and the blood may spill into either the inside of the brain or the space between the brain and its subarachnoid covering.
—Matt Hrodey, Discover Magazine, 22 May 2023
Blood thinners, bleeding disorders, or head injuries may cause subarachnoid bleeding.
—Alyssa Hui, Health, 12 Apr. 2023
Moderate to severe TBIs can also include contusions, or bruising of the brain tissue; or hemorrhages—both intracerebral hemorrhages and subarachnoid hemorrhages—which is when active bleeding is present, according to the American Association of Neurological Surgeons (AANS).
—Ashley Abramson, Health.com, 14 Feb. 2022
Cite this Entry
“Subarachnoid.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/subarachnoid. Accessed 20 May. 2025.
Copy CitationMedical Definition
subarachnoid
adjective
sub·arach·noid
ˌsəb-ə-ˈrak-ˌnȯid
variants
also subarachnoidal
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
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