#spiders

• Arachnids — An alternative spelling variant for arahnide (arachnids); a major class of terrestrial or aquatic chelicerate arthropods, characterized by a body segmented into a cephalothorax and abdomen, the lack of antennae, the presence of two pairs of mouth appendages (chelicerae and pedipalps), and exactly eight articulated legs. The class includes spiders, scorpions, harvestmen, mites, and ticks, playing a vital ecological role as insect predators.
• Arachnophobia — A persistent, abnormal, and unwarranted fear of spiders or other arachnids, representing one of the most common specific animal phobias experienced by humans worldwide. This anxiety disorder triggers extreme emotional and physiological reactions, such as panic attacks, heavy sweating, and severe avoidance behaviors, even at the mere sight of a picture or the anticipation of a spider's presence.
• Arachnophobia — A pathological, intense, persistent, and irrational fear of spiders or other arachnids, representing one of the most widespread specific animal phobias identified in the human species. This anxiety disorder dictates severe neurovegetative reactions, such as immediate panic attacks, palpitations, and an uncontrollable urge to escape, triggered not only by physical contact but also by images, simulations, or the mere anticipation of a spider's presence.
• Arachnologist — A woman who specializes in arachnology; a female biologist or zoologist dedicated to the scientific and methodical study of organisms within the class Arachnida, such as spiders, scorpions, mites, and harvestmen. Her activity encompasses field work for collecting specimens, laboratory taxonomic analysis, describing new species, and studying the ecological or biochemical impact of these invertebrates venoms.
• Arachnological — Pertaining to arachnology, relating to the scientific study of spiders and other arachnids; specific to research analyzing the taxonomy, ecology, behavior, or biology of the class Arachnida. The term describes elements associated with this field, such as a specimen collection, a specialized journal, an international congress, or a field sampling method.
• Arachnology — A specialized branch of zoology that deals with the scientific, systematic, and methodical study of organisms classified within the class Arachnida, including spiders, scorpions, harvestmen, and mites. Unlike entomology, which analyzes insects, this discipline focuses on the structural biology, phylogenetic taxonomy, behavioral ecology, and biochemical properties of venoms and silks specific to terrestrial chelicerates.