Definition of “subarachnoid” - English Dictionary

british dictionary

“subarachnoid” in British English

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uk /ˌsʌb.əˈræk.nɔɪd/ us /ˌsʌb.əˈræk.nɔɪd/ specialized

used to refer to the layer of tissue under the arachnoid membrane that covers the brain and spinal cord:

a subarachnoid haemorrhage
a subarachnoid layer

(Definition of “subarachnoid” from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)