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subarachnoid

[suhb-uh-rak-noid] /ˌsʌb əˈræk nɔɪd/
adjective, Anatomy
1.
of, relating to, or situated below the arachnoid membrane.
Origin of subarachnoid
1830-1840
1830-40; sub- + arachnoid
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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