\A*ra`ne*i"na\, n. pl. [NL., fr. L. aranea spider.]
(Zo["o]l.)
The order of Arachnida that includes the spiders.
Note: They have mandibles, modified a poison fa?gs, leglike
      palpi, simple eyes, abdomen without segments, and
      spinnerets for spinning a web. They breathe by
      pulmonary sacs and trache[ae] in the abdomen. See
      Illustration in Appendix.