| subarachnoidal | <anatomy> Situated under the arachnoid membrane. Source: Websters Dictionary (01 Mar 1998) |
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| subarachnoidal cisterns | Widening portions of the subarachnoid space within the cranium where the arachnoid bridges over a depression on the surface of the brain. See: subarachnoid space. Synonym: cisternae subarachnoideales. (05 Mar 2000) |