(economics) The paradox raised by a particular (theoretical) lottery game that leads to a random variable with infinite expected value (i.e. infinite expected payoff) but nevertheless seems to be worth only a very small amount to the participants.

plural of St. Petersburg paradox

The phenomenon that people can sometimes recover more quickly from more intense emotions or pain than from less distressing experiences, tentatively attributed to the fact that only the more intense states trigger psychological defense processes.

(mathematics) A theorem in set-theoretic geometry, which states that given a solid ball in three‑dimensional space, there exists a decomposition of the ball into a finite number of disjoint subsets, which can then be put back together in a different way to yield two identical copies of the original ball.

Pseudis paradoxa, a species of frog unusual because it is larger as a tadpole (up to 25 cm or 10 in. long) than as an adult (about a quarter of that length).

Removal of one's clothes while in a state of hypothermia.

plural of paradoxical frog

(psychotherapy) A psychotherapeutic technique used to treat anxiety by repeatedly rehearsing the anxiety-inducing pattern of thought or behaviour, often with exaggeration and humor.

plural of paradoxical rage reaction

(medicine) An aggressive behaviour sometimes manifested by patients taking certain drugs, such as benzodiazepines.