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.
1 The vast majority of people will never have an anaphylactic reaction. 2  The most common causes of anaphylaxis include drugs, such as penicillin, insect stings, foods (peanuts, shellfish), X-ray dye, and latex. 3  The symptoms of anaphylaxis may vary and can include hives, tongue swelling, vomiting, and even shock.