subarachnoid

adjective

sub·​arach·​noid ˌsəb-ə-ˈrak-ˌnȯid 

variants or less commonly subarachnoidal

ˌsəb-ə-rak-ˈnȯi-dᵊl 

: 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

Word History

First Known Use

1843, in the meaning defined above

Rhymes for subarachnoid

• albuminoid
• arytenoid
• cannabinoid
• carotenoid
• epidermoid
• epithelioid
• meteoroid
• paraboloid
• underemployed
• adenoid
• alkaloid
• amoeboid

Medical Definition

subarachnoid

adjective

sub·​arach·​noid ˌsəb-ə-ˈrak-ˌnȯid 

variants also subarachnoidal

-rak-ˈnȯid-ᵊl 

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