arachnoid (adj.)youdaoicibaDictYouDict[arachnoid 词源字典]
"cobweb-like," especially of the membrane around the brain and spinal cord, 1789, from Modern Latin arachnoides, from Greek arakhnoeides "cobweb-like," from arakhne "cobweb" (see arachnid) + -oeides (see -oid).[arachnoid etymology, arachnoid origin, 英语词源]