kneeboard 
noun
A short board for surfing or waterskiing in a kneeling position.Once he told me that any board is a kneeboard; you could ride a longboard on your knees if you wanted to....
- Instead of my usual bodyboard or kneeboard I've come equipped with a new device: a home-made handboard.
- If a personal watercraft is towing another person on skis, kneeboards, or other devices, a second person must face the rear to monitor the person being towed.
Derivatives
kneeboarder
- A rare treat thanks to Hurricanes Elida and Douglas was the North Malibu opportunity to see some kneeboarders in action.
- All surfing disciplines were on show from kneeboarders, to longboarders and the overall quality of the riders on display was the highest I have seen.
- Team selection was based on the top, consistent scores notched up by UK kneeboarders based on this year's national championship results.
kneeboarding
- How do you feel about the obvious, insurmountable differences in performance that exist between bodysurfing and the much faster, more maneuverable kneeboarding or body boarding?
- Without this magazine we'd have to think bodyboarding as a sport could be headed the way of serious bodysurfing or even kneeboarding.
- But, all too often, it is used as a stepping stone to conventional skis or wakeboarding and the skill of kneeboarding is taken no further.