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.
Only a few species are seriously poisonous to humans. There are these few spiders: black widow, African brown spider, bird spider, and if you ever see a spider with a vi â¦ olin shape on its back stay clear this spider can kill and is known for it.*Edit: The violin spider (or Brown Recluse, Loxosceles Reclusa, or Fiddleback spider) mentioned above is NOT deadly.here are these few spiders: black widow, African brown spider, bird spider, and if you ever see a spider with a vi â¦ olin shape on its back stay clear this spider can kill and is known for it. *Edit: The violin spider (or Brown Recluse, Loxosceles Reclusa, or Fiddleback spider) mentioned above is NOT deadly.