arachnological

ar·ach·nol·o·gy

A5415300 (ăr′ək-nŏl′ə-gē)n. The branch of zoology that deals with spiders and other arachnids.
[Greek arakhnē, spider + -logy.]
ar′ach·no·log′i·cal (-nə-lŏj′ĭ-kəl) adj.ar′ach·nol′o·gist n.

arachnological

(əˌræknəˈlɒdʒɪkəl) adjrelating to arachnology