The definition of a possum, or opossum, is a tree-dwelling nocturnal marsupial with fur and a prehensile tail. A small Australian mammal that lives in a tree and only comes out at night is an example of a possum. possum. possum.
More than two thirds of patients who die of anaphylaxis do so within the first: half hour. ____, a harsh, high-pitched inspiratory sound, occurs when swelling in the upper airway closes off the airway; the swelling can eventually lead to total obstruction. Stridor.
Anaphylaxis symptoms occur suddenly and can progress quickly. The early symptoms may be mild, such as a runny nose, a skin rash or a strange feeling.. These symptoms can quickly lead to more serious problems, including: 1  Trouble breathing. 2  Hives or swelling. 3  Tightness of the throat. 4  Hoarse voice. 5  Nausea. 6  Vomiting. 7  Abdominal pain.