1

arachnoid

play
adjective arach·noid \ə-ˈrak-ˌnȯid\

Definition of arachnoid

  1. 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. 2 :  covered with or composed of soft loose hairs or fibers

1789

First Known Use of arachnoid

1789


2

arachnoid

noun arach·noid

Definition of arachnoid

  1. :  an arachnoid membrane

Origin and Etymology of arachnoid

New Latin arachnoides, from Greek arachnoeidēs, like a cobweb, from arachnē spiderweb


First Known Use: 1804


3

arachnoid

adjective arach·noid

Definition of arachnoid

  1. :  resembling or related to the arachnids

Origin and Etymology of arachnoid

New Latin Arachnida + English -oid


First Known Use: 1825


Medical Dictionary

1

arachnoid

play
noun arach·noid \ə-ˈrak-ˌnȯid\

Medical Definition of arachnoid

  1. :  a thin membrane of the brain and spinal cord that lies between the dura mater and the pia mater


2

arachnoid

adjective arach·noid
variants: also

arachnoidal

\ə-ˌrak-ˈnȯid-əl\play

Medical Definition of arachnoid

  1. :  of or relating to the arachnoid the arachnoid membrane

Learn More about arachnoid


Seen and Heard

What made you want to look up arachnoid? Please tell us where you read or heard it (including the quote, if possible).

WORD OF THE DAY

contemplative of or relative to the past

Get Word of the Day daily email!

WORD GAMES

Take a 3-minute break and test your skills!

  • manet-jeanne-spring
  • Which is a synonym of chaffer?
Name That Thing

Test your visual vocabulary with our 10-question challenge!

TAKE THE QUIZ
SCRABBLE® Sprint

Test Your Knowledge - and learn some interesting things along the way.

TAKE THE QUIZ