1. (

• arachnoid ,
• arachnoid_membrane

) the middle of the 3 meninges ;

2. (

• arachnid ,
• arachnoid

) air-breathing arthropods characterized by simple eyes and four pairs of legs ;

1. (

• arachnoid ,
• arachnidian ,
• spidery ,
• spiderlike ,
• spiderly

) relating to or resembling a member of the class Arachnida ;