"arachnoid" in the noun sense
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
"arachnoid" in the adjective sense
1. arachnoid, arachnidian, spidery, spiderlike, spiderly
relating to or resembling a member of the class Arachnida
Source: WordNet® (An amazing lexical database of English)
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