Dictionary

1arachnoid

adjective arach·noid \ə-ˈrak-ˌnid\

Definition of ARACHNOID

1
:  of or relating to a thin membrane of the brain and spinal cord that lies between the dura mater and the pia mater
2
:  covered with or composed of soft loose hairs or fibers
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First Known Use of ARACHNOID

1789

2arachnoid

noun

Definition of ARACHNOID

:  an arachnoid membrane

Origin of ARACHNOID

New Latin arachnoides, from Greek arachnoeidēs, like a cobweb, from arachnē spiderweb
First Known Use: 1804

3arachnoid

adjective

Definition of ARACHNOID

:  resembling or related to the arachnids

Origin of ARACHNOID

New Latin Arachnida + English -oid
First Known Use: 1825

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