ARACHNIDA
\ɐɹˈaknɪdə], \ɐɹˈaknɪdə], \ɐ_ɹ_ˈa_k_n_ɪ_d_ə]\
Definitions of ARACHNIDA
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a large class of arthropods including spiders and ticks and scorpions and daddy longlegs; have four pairs of walking legs and no wings
By Princeton University