Quick Quiz: Nouns Score: Change category, Flip order Reset Incorrect! Try again. Noun: radial engine Your choice? an internal-combustion engine having cylinders arranged radially around a central crankcase the amount of electromagnetic radiation leaving or arriving at a point on a surface the part of a radio receiver by means of which radio signals are received a joint between the distal end of the radius and the proximal row of carpal bones   (Noun: radiocarpal joint)