‖A‐ra′ne‐i″na (ȧ‐rā′nē̍‐ī″nȧ), n. pl. [NL., fr. L. aranea spider.] (Zoöl.) The order of Arachnida that includes the spiders.
☞ They have mandibles, modified as poison fangs, leglike palpi, simple eyes, abdomen without segments, and spinnerets for spinning a web. They breathe by pulmonary sacs and tracheæ in the abdomen. See Illustration in Appendix.