arachnoid

[ uh-rak-noid ]
/ əˈræk nɔɪd /

adjective

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.

noun

an arachnid.
Anatomy. the serous membrane forming the middle of the three coverings of the brain and spinal cord.
Compare dura mater, meninges, pia mater.

Origin of arachnoid

1745–55; < New Latin arachnoīdes < Greek arachnoeidḗs cobweblike. See arachnid, -oid

Words nearby arachnoid

arachne, arachnid, arachnida, arachnidism, arachnodactyly, arachnoid, arachnoid cyst, arachnoid granulation, arachnoid membrane, arachnoid villus, arachnoiditis

Example sentences from the Web for arachnoid

British Dictionary definitions for arachnoid

arachnoid
/ (əˈræknɔɪd) /

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

Medical definitions for arachnoid

arachnoid
[ ə-răk′noid′ ]

adj.

Resembling a cobweb. Used of the arachnoid membrane covering the brain and spinal cord.

Scientific definitions for arachnoid

arachnoid
[ ə-răk′noid′ ]

The delicate membrane that encloses the spinal cord and brain and lies between the pia mater and dura mater.