1. arachnid n. a member of the family Arachnida, which principally includes animals with four pairs of legs and no antennae, such as spiders, scorpions, mites, and ticks 蛛形纲动物(诸如蜘蛛、蝎子、螨、蜱) My interest in arachnids began when I used to watch spiders b...