Word forms: (regular plural) A-arms
(Automotive engineering: Vehicle components, Brakes, steering, wheels, tires, and suspension) An A-arm is part of a vehicle's suspension that consists of two rods in the shape of a letter A.
⇒ The A-arm suspension consists of a pair of upper and lower lateral arms. ⇒ The standard suspension set-up at the front of the vehicle is MacPherson struts with
lower A-arm and anti-roll bar. ⇒ The suspension is superb - an independent double A-arm set-up at the front and a five-link solid axle in the rear.
Collins English Dictionary. Copyright © HarperCollins Publishers