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resembling a spider’s web.
of or belonging to the arachnids.
anatomy. of or relating to the arachnoid membrane.
botany. formed of or covered with long, delicate hairs or fibers.
an arachnid.
anatomy. the serous membrane forming the middle of the three coverings of the brain and spinal cord.
historical examples

meanwhile, we’re disgorging the arachnoid membranes with cowld applications, and we’re relievin’ the cerebellum by repose.
the fortunes of glencore charles james lever

cobwebby, same as arachnoid; bearing hairs like cobwebs or gossamer.
the elements of botany asa gray

the arachnoid is a thin membrane which lies beneath the dura mater.
a practical physiology albert f. blaisdell

all the ventricles of the brain were dilated with serum, and there was a good deal of effusion into the arachnoid and pia mater.
on the origin of inflammation of the veins henry lee

in cortinarius, the veil is composed of arachnoid threads, and the spores are rusty.
fungi: their nature and uses mordecai cubitt cooke

neither is the arachnoid often affected with acute inflammation, except as a secondary result.
special report on diseases of the horse united states department of agriculture

mites and ticks are cl-ssified with the spiders as degenerate relatives of arachnoid stock.
zoology: the science of animal life ernest ingersoll

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

when traced through the dura mater they are found to spring from the arachnoid.
encyclopaedia britannica, 11th edition, volume 4, slice 4 various

from its resemblance to a spider’s web such a veil is said to be arachnoid.
studies of american fungi. mushrooms, edible, poisonous, etc. george francis atkinson

noun
the middle of the three membranes that cover the brain and spinal cord see meninges
another name for arachnid
adjective
of or relating to the middle of the three meninges
(botany) consisting of or covered with soft fine hairs or fibres
of or relating to the arachnids
adj.

“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).

arachnoid a·rach·noid (ə-rāk’noid’)
adj.
resembling a cobweb. used of the arachnoid membrane covering the brain and spinal cord.
arachnoid
(ə-rāk’noid’)
the delicate membrane that encloses the spinal cord and brain and lies between the pia mater and dura mater.