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.
Wolf spiders are actually not poisonous. Instead of asking the question are wolf spiders poisonous, we should be asking if wolf spiders are venomous instead. We often interchange the use of venom and poison but in fact, they are technically different. The difference will be discussed as follows: