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.
Non-poisonous kind of spider. These spiders are not poisonous to humans. Unless you are allergic to spiderâs venom, you will notice that the area bitten will have a significant swelling and is painful and itchy similar to the symptom of a wasp bite. It becomes serious when you experience chills, headaches, vomiting and painful muscle and joints.