Not poisonous or productive of poison. A list of substances considered generally nontoxic is provided in the Appendix.
Failure to unite, as a fractured bone that fails to heal completely. Diagnosis of nonunion is established when a minimum of 9 months has elapsed since the injury and the fracture site shows no progressive signs of healing for a minimum of 3 months and is not complicated by a synovial pseudoar throsis.