arachnoid

American  

[uh-rak-noid] / əˈræk nɔɪd /

adjective

1. resembling a spider's web.

2. of or belonging to the arachnids.

3. Anatomy. of or relating to the arachnoid membrane.

4. Botany. formed of or covered with long, delicate hairs or fibers.

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noun

1. an arachnid.

2. Anatomy. the serous membrane forming the middle of the three coverings of the brain and spinal cord.

arachnoid British  

/ əˈræknɔɪd /

noun

1. the middle of the three membranes that cover the brain and spinal cord See meninges

2. another name for arachnid

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adjective

1. of or relating to the middle of the three meninges

2. botany consisting of or covered with soft fine hairs or fibres

3. of or relating to the arachnids

arachnoid Scientific  

/ ə-răk′noid′ /

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

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Etymology

Origin of arachnoid

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

Example Sentences

The ARACHNOID, so called from its extreme tenuity, is the serous membrane of the brain and spinal cord, and is, like other serous membranes, a closed sac.

From A Treatise on Anatomy, Physiology, and Hygiene (Revised Edition) by Cutter, Calvin