a·rach·nid ( -r k n d)n. Any of various arthropods of the class Arachnida, such as spiders, scorpions, mites, and ticks, characterized by four pairs of segmented legs and a body that is divided into two regions, the cephalothorax and the abdomen. Also called arachnoid. [From New Latin Arachnida, class name, from Greek arakhn  , spider.]a·rach ni·dan (-n-dn) adj. & n. |
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