ARACHNID Meaning of ARACHNID in English [ ə'raknɪd ]■ noun Zoology an arthropod of the class Arachnida, which includes spiders, scorpions, mites, and ticks.Originfrom mod. L. Arachnida , from Gk arakhnē 'spider'. Concise Oxford English vocab. Сжатый оксфордский словарь английского языка. 2004