Poisoning or illness caused by the bite or sting of a spider, scorpion, or other arachnid.
From 'arachnid' + '-ism' (suffix for conditions or states). Formalized in medical terminology in the 1800s as doctors catalogued spider and scorpion envenomations.
Most cases of arachnidism are minor because most arachnids are tiny or their venom is weak—but the Brazilian wandering spider's venom is so potent it can cause full-body paralysis!
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