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.
Symptoms of an anaphylaxis reaction can include: 1  Trouble breathing. 2  Chest tightness. 3  Dizziness or lightheadedness. 4  Nausea or vomiting. 5  Difficulty swallowing. 6  Fainting. 7  Itching and hives. 8  Swelling of the, face, eyes, mouth, tongue and throat.