Definition: air-breathing arthropods characterized by simple eyes and four pairs of legs
Similar words: arthropod
Definition: invertebrate having jointed limbs and a segmented body with an exoskeleton made of chitin
Synonyms: arachnoid, arachnoid membrane
Definition: the middle of the 3 meninges
Similar words: meninges, meninx
Definition: a membrane (one of 3) that envelops the brain and spinal cord