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The Collaborative International Dictionary
Araneous

Araneous \A*ra"ne*ous\ ([.a]*r[=a]`n[-e]*[u^]s),

  1. [L. araneosus, fr. aranea spider, spider's we

  2. ] Cobweblike; extremely thin and delicate, like a cobweb; as, the araneous membrane of the eye. See Arachnoid.
    --Derham. [1913 Webster] ||

Wiktionary
araneous
  1. Extremely thin and delicate, like a cobwe