- arachnoideal
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adj. [Gr. arachne, spider; eidos, form](ARTHROPODA: Chelicerata)1. Resembling a member of the Arachnida.2. Resembling a spider\'s web, thin and fine, filmy.
Online Dictionary of Invertebrate Zoology. A.R. Maggenti and S.L. Gardne. 2005.