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.
What is the fear of spiders called? A: The fear of spiders is called arachnophobia. The term originates from the Greek word Arachne, which means 'spider', and the English word, phobia, which means an extreme aversion to or fear of something. Continue Reading. Sufferers of Arachnophobia purposely avoid contact with spiders because exposure leads to the experience of negative symptoms.