kneeboard noun 3verb 1forms 3 noun3 •A short (often less than 6'), broad (sometimes extremely broad) surfboard designed to be ridden in the surf in a kneeling position, and often having traction pads in the central area as an alternative to wax, to help the knees grip the deck. •A short wakeboard designed to be ridden in the kneeling position. •A clipboard carried in the lap of an airplane pilot, on which basic flight data is recorded. verb1 •to surf or water-ski using a kneeboard formskneeboarded · kneeboarding · kneeboards