The observation that the French suffer a relatively low incidence of coronary heart disease, despite having a diet relatively rich in saturated fats.

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).

(psychiatry) A mental disorder characterized by paranoia and a pervasive, long-standing suspiciousness and generalized mistrust of others.

(idiomatic) An unexpected problem in a supposedly positive situation, especially in a marital or romantic relationship.

(computing) A physical interface capable of transmitting multiple bits of data simultaneously.

plural of parallel port

To park a vehicle with side parallel to the curb or the side of the road in line with other parked vehicles.

A time travel paradox in which the consequences of an event in the future travel back in time and cause an event in the past or present, which in turn is among the causes of the first event, forming a causal loop in which each event is caused by the other.

The paradox of time travel in which inconsistencies emerge through changing the past.

(rare) The statistical and psychological observation that a person is prone to prefer Coca-Cola over Pepsi when they have labels, but prone to prefer Pepsi over Coca-Cola when they are unlabelled.