Medical Definition of ARTHRODESIS. : the surgical immobilization of a joint so that the bones grow solidly together: artificial ankylosis. the surgical immobilization of a joint so that the bones grow solidly together. ADVERTISEMENT.
Trapdoor spiders are not particularly harmful to man however, like Tarantulas, the tiny hairs on the legs of some species leave tiny red marks where the toothed hairs on the spiders' feet have clung to the skin. Mouse spiders are also a type of Trapdoor spider with huge chelicerae and may measure up to 35mm in body length.
Are Wolf Spiders Poisonous â Poison VS Venom. Wolf spiders, like all other spiders have venom, but that does not make them poisonous. A poison has to be absorbed or ingested to cause harm, a venom is injected to cause harm. We can say that snakes are venomous, and a puffer fish is poisonous, and that will be correct.