Formula One glossary

A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

Understeer: A lack of grip at the front wheels, which makes the car feel like slipping away at the front while cornering. Such instability is mostly solved by softening the front suspension or adding downforce on the front wing.
Undertray: Also known as the floor, the undertray houses the monocoque, engine/gearbox, and other chassis components.
Unsprung weight: This refers to all parts of the vehicle that are not supported by the suspension system, wheels, tires, etc.
Upright: A racing car upright is a component that links the suspension arms to the wheel's pinion. Attached to the upright are the brake pads and calipers, along with brake cooling components. In Formula One, an upright is currently machined out of a homogeneous metallic material as specified by the technical regulations.

The current FIA regulations can be found on the FIA website

More about these and previous rules can be found in the f1technical regulations section.