any of a large class (Arachnida) of chiefly terrestrial arthropods, including spiders, scorpions, mites, and ticks, typically with four pairs of legs, either lungs or tracheae, a liquid diet, no antennae, simple eyes, sensory pedipalps, and a body divided into cephalothorax and abdomen
Origin of arachnidfrom Classical Greek arachn?, spider, akin to Classical Latin araneus
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.
Origin of arachnidFrom New Latin Arachnida class name from Greek arakhnē spider
French arachnide (1809, Lamarck), from Ancient Greek ἀράχνη (arakhnē, “spider”).