Definitions

1. adjective

relating to or resembling spiders

“The arachnoid pattern on her dress was intricate and beautiful.”

2. adjective

relating to the arachnoid membrane

“The arachnoid membrane surrounds the brain and spinal cord.”

3. noun

the arachnoid membrane, especially as a layer of tissue separating the brain and spinal cord from the dura mater

“The surgeon carefully removed the arachnoid membrane to prevent further damage.”

4. noun

a person who is afraid of spiders or other arachnids

“She was an arachnoid, and the sight of a tarantula made her run away.”

5. noun

a type of rock that contains arachnoid structures

“The geologist discovered a unique arachnoid rock formation in the desert.”