trioval

plural triovals · alternative tri-oval

1. A shape that is a hybrid of triangle and oval, sometimes used for motor racetracks.

   It is a 2.66-mile trioval with long stretches of speed-building asphalt, which have been made less threatening by restrictor plates that cut the horsepower of the powerful stock car engines.

   2007 October 7, Ray Glier, “Talladega Nightmares for the Chase”, in New York Times