Examples from the Web for arachnoid
Arachnoid, said of the veil when it is cobwebby, that is, formed of loose threads.Studies of American Fungi. Mushrooms, Edible, Poisonous, etc.|George Francis Atkinson
All the ventricles of the brain were dilated with serum, and there was a good deal of effusion into the arachnoid and pia mater.
The lymph was purely basal, solely on the arachnoid, not in the fissures or sulci.A History of Epidemics in Britain, Volume II (of 2)|Charles Creighton
On examination pus was found between the arachnoid and the pia mater.
In a case in Dublin,47 there was no meningeal lesion except in a "few dark spots like sanguineous effusion under the arachnoid."
British Dictionary definitions for arachnoid
Word Origin and History for arachnoid
"cobweb-like," especially of the membrane around the brain and spinal cord, 1789, from Modern Latin arachnoides, from Greek arakhnoeides "cobweb-like," from arakhne "cobweb" (see arachnid) + -oeides (see -oid).