• (n. pl.) The order of Arachnida that includes the spiders.
A·ra`ne·i'na (ȧ*rā`ne*ī'nȧ) noun plural [ New Latin , from Latin aranea spider.] (Zoology) The order of Arachnida that includes the spiders. » They have mandibles, modified as poison fangs, leglike palpi, simple eyes, abdomen without segments, and ...