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.
It is huge. It has one of the most painful bites in the spider world. It is the most deadly spider; forget the funnel web spider â this thing is dangerous. It has the highest human kill rate in the world. To make things even worse, a bite from this spider causes an erection that lasts for hours.