Advertisement

Advertisement

arachnoid

[ uh-rak-noid ]

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.


noun

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

arachnoid

/ əˈræknɔɪd /

noun

  1. the middle of the three membranes that cover the brain and spinal cord See meninges
  2. another name for arachnid
“Collins English Dictionary — Complete & Unabridged” 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012


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
“Collins English Dictionary — Complete & Unabridged” 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

arachnoid

/ ə-răknoid′ /

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


Discover More

Word History and Origins

Origin of arachnoid1

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

Example Sentences

The researchers tracked antigens and other substances crossing the arachnoid barrier, an obstacle that’s known for its impermeability but which, they found, leaks in this particular area.

He coped for two decades with headaches caused by an arachnoid cyst in his brain.

The arachnoid has also shown slight congestion, and in other cases the membranes showed a slight thickening.

The lymph was purely basal, solely on the arachnoid, not in the fissures or sulci.

In quite young specimens the collector will notice two well defined arachnoid veils, the lower one being much more dense.

From its resemblance to a spider's web such a veil is said to be arachnoid.

Let them form arachnoid associations, spinsters and spiders would be a good motto.

Advertisement

Advertisement

Advertisement

Advertisement


arachnidarachnology