predatory arachnid with eight legs, two poison fangs, two feelers, and usually two silk-spinning organs at the back end of the body; they spin silk to make cocoons for eggs or traps for prey

large southern European spider once thought to be the cause of tarantism (uncontrollable bodily movement)

toxin secreted by animals; secreted by certain snakes and poisonous insects (e.g., spiders and scorpions)

A structure of delicate, threadlike filaments characteristically spun by spiders or certain insect larva, A membrane or fold of skin connecting the toes, as of certain amphibians, birds, and mammals, A metal sheet or plate connecting the heavier sections, ribs, or flanges of a structural element